[453] | 1 | // Copyright (c) Microsoft. All rights reserved.
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| 2 | // Licensed under the MIT license. See LICENSE file in the project root for full license information.
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| 3 |
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| 4 | #include <stdlib.h>
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| 5 | #include <stddef.h>
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| 6 | #include <stdio.h>
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| 7 | #include <string.h>
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| 8 | #include "azure_c_shared_utility/tlsio.h"
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| 9 | #include "azure_c_shared_utility/tlsio_esp_at.h"
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| 10 | #include "azure_c_shared_utility/singlylinkedlist.h"
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| 11 | #include "azure_c_shared_utility/esp_at_socket.h"
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| 12 | #include "azure_c_shared_utility/optimize_size.h"
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| 13 | #include "azure_c_shared_utility/xlogging.h"
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| 14 |
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| 15 | #define ESP_AT_XIO_RECEIVE_BUFFER_SIZE 128
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| 16 |
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| 17 | typedef enum IO_STATE_TAG
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| 18 | {
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| 19 | IO_STATE_CLOSED,
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| 20 | IO_STATE_OPENING,
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| 21 | IO_STATE_OPEN,
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| 22 | IO_STATE_CLOSING,
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| 23 | IO_STATE_ERROR
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| 24 | } IO_STATE;
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| 25 |
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| 26 | typedef struct PENDING_TLS_IO_TAG
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| 27 | {
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| 28 | unsigned char* bytes;
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| 29 | size_t size;
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| 30 | ON_SEND_COMPLETE on_send_complete;
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| 31 | void* callback_context;
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| 32 | SINGLYLINKEDLIST_HANDLE pending_io_list;
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| 33 | } PENDING_TLS_IO;
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| 34 |
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| 35 | typedef struct TLS_IO_INSTANCE_TAG
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| 36 | {
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| 37 | ESP_AT_SOCKET_HANDLE tcp_socket_connection;
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| 38 | ON_BYTES_RECEIVED on_bytes_received;
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| 39 | ON_IO_ERROR on_io_error;
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| 40 | void* on_bytes_received_context;
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| 41 | void* on_io_error_context;
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| 42 | char* hostname;
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| 43 | int port;
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| 44 | IO_STATE io_state;
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| 45 | SINGLYLINKEDLIST_HANDLE pending_io_list;
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| 46 | } TLS_IO_INSTANCE;
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| 47 |
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| 48 | /*this function will clone an option given by name and value*/
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| 49 | static void* tlsio_esp_at_CloneOption(const char* name, const void* value)
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| 50 | {
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| 51 | (void)name;
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| 52 | (void)value;
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| 53 | return NULL;
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| 54 | }
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| 55 |
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| 56 | /*this function destroys an option previously created*/
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| 57 | static void tlsio_esp_at_DestroyOption(const char* name, const void* value)
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| 58 | {
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| 59 | (void)name;
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| 60 | (void)value;
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| 61 | }
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| 62 |
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| 63 | static OPTIONHANDLER_HANDLE tlsio_esp_at_retrieveoptions(CONCRETE_IO_HANDLE tlsio_esp_at)
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| 64 | {
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| 65 | OPTIONHANDLER_HANDLE result;
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| 66 | (void)tlsio_esp_at;
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| 67 | result = OptionHandler_Create(tlsio_esp_at_CloneOption, tlsio_esp_at_DestroyOption, tlsio_esp_at_setoption);
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| 68 | if (result == NULL)
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| 69 | {
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| 70 | /*return as is*/
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| 71 | }
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| 72 | else
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| 73 | {
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| 74 | /*insert here work to add the options to "result" handle*/
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| 75 | }
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| 76 | return result;
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| 77 | }
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| 78 |
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| 79 | static const IO_INTERFACE_DESCRIPTION tlsio_esp_at_interface_description =
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| 80 | {
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| 81 | tlsio_esp_at_retrieveoptions,
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| 82 | tlsio_esp_at_create,
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| 83 | tlsio_esp_at_destroy,
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| 84 | tlsio_esp_at_open,
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| 85 | tlsio_esp_at_close,
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| 86 | tlsio_esp_at_send,
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| 87 | tlsio_esp_at_dowork,
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| 88 | tlsio_esp_at_setoption
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| 89 | };
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| 90 |
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| 91 | static void indicate_error(TLS_IO_INSTANCE* tlsio_esp_at_instance)
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| 92 | {
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| 93 | if ((tlsio_esp_at_instance->io_state == IO_STATE_CLOSED)
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| 94 | || (tlsio_esp_at_instance->io_state == IO_STATE_ERROR))
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| 95 | {
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| 96 | return;
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| 97 | }
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| 98 | tlsio_esp_at_instance->io_state = IO_STATE_ERROR;
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| 99 | if (tlsio_esp_at_instance->on_io_error != NULL)
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| 100 | {
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| 101 | tlsio_esp_at_instance->on_io_error(tlsio_esp_at_instance->on_io_error_context);
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| 102 | }
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| 103 | }
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| 104 |
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| 105 | static int add_pending_io(TLS_IO_INSTANCE* tlsio_esp_at_instance, const unsigned char* buffer, size_t size, ON_SEND_COMPLETE on_send_complete, void* callback_context)
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| 106 | {
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| 107 | int result;
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| 108 | PENDING_TLS_IO* pending_tlsio_esp_at = (PENDING_TLS_IO*)malloc(sizeof(PENDING_TLS_IO));
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| 109 | if (pending_tlsio_esp_at == NULL)
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| 110 | {
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| 111 | LogError("Allocation Failure: Unable to allocate pending list.");
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| 112 | result = MU_FAILURE;
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| 113 | }
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| 114 | else
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| 115 | {
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| 116 | pending_tlsio_esp_at->bytes = (unsigned char*)malloc(size);
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| 117 | if (pending_tlsio_esp_at->bytes == NULL)
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| 118 | {
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| 119 | LogError("Allocation Failure: Unable to allocate pending list.");
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| 120 | free(pending_tlsio_esp_at);
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| 121 | result = MU_FAILURE;
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| 122 | }
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| 123 | else
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| 124 | {
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| 125 | pending_tlsio_esp_at->size = size;
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| 126 | pending_tlsio_esp_at->on_send_complete = on_send_complete;
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| 127 | pending_tlsio_esp_at->callback_context = callback_context;
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| 128 | pending_tlsio_esp_at->pending_io_list = tlsio_esp_at_instance->pending_io_list;
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| 129 | (void)memcpy(pending_tlsio_esp_at->bytes, buffer, size);
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| 130 | if (singlylinkedlist_add(tlsio_esp_at_instance->pending_io_list, pending_tlsio_esp_at) == NULL)
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| 131 | {
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| 132 | LogError("Failure: Unable to add socket to pending list.");
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| 133 | free(pending_tlsio_esp_at->bytes);
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| 134 | free(pending_tlsio_esp_at);
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| 135 | result = MU_FAILURE;
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| 136 | }
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| 137 | else
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| 138 | {
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| 139 | result = 0;
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| 140 | }
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| 141 | }
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| 142 | }
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| 143 |
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| 144 | return result;
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| 145 | }
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| 146 |
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| 147 | #define NSAPI_ERROR_WOULD_BLOCK -3001
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| 148 |
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| 149 | static int retrieve_data(TLS_IO_INSTANCE* tlsio_esp_at_instance)
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| 150 | {
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| 151 | int received = 1;
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| 152 | int total_received = 0;
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| 153 |
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| 154 | unsigned char* recv_bytes = malloc(ESP_AT_XIO_RECEIVE_BUFFER_SIZE);
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| 155 | if (recv_bytes == NULL)
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| 156 | {
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| 157 | LogError("Socketio_Failure: NULL allocating input buffer.");
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| 158 | indicate_error(tlsio_esp_at_instance);
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| 159 | return -1;
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| 160 | }
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| 161 |
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| 162 | while (received > 0)
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| 163 | {
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| 164 | received = esp_at_socket_receive(tlsio_esp_at_instance->tcp_socket_connection, (char*)recv_bytes, ESP_AT_XIO_RECEIVE_BUFFER_SIZE);
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| 165 | if (received > 0)
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| 166 | {
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| 167 | total_received += received;
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| 168 | if (tlsio_esp_at_instance->on_bytes_received != NULL)
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| 169 | {
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| 170 | /* explictly ignoring here the result of the callback */
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| 171 | tlsio_esp_at_instance->on_bytes_received(tlsio_esp_at_instance->on_bytes_received_context, recv_bytes, received);
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| 172 | }
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| 173 | }
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| 174 | else if (received < 0)
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| 175 | {
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| 176 | if(received != NSAPI_ERROR_WOULD_BLOCK) // NSAPI_ERROR_WOULD_BLOCK is not a real error but pending.
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| 177 | {
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| 178 | indicate_error(tlsio_esp_at_instance);
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| 179 | LogError("Socketio_Failure: underlying IO error %d.", received);
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| 180 | free(recv_bytes);
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| 181 | return -1;
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| 182 | }
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| 183 | }
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| 184 | }
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| 185 | free(recv_bytes);
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| 186 |
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| 187 | return total_received;
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| 188 | }
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| 189 |
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| 190 | static int send_queued_data(TLS_IO_INSTANCE* tlsio_esp_at_instance)
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| 191 | {
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| 192 | int errors = 0;
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| 193 | int sent = 0;
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| 194 |
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| 195 | LIST_ITEM_HANDLE first_pending_io = singlylinkedlist_get_head_item(tlsio_esp_at_instance->pending_io_list);
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| 196 | while (first_pending_io != NULL)
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| 197 | {
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| 198 | PENDING_TLS_IO* pending_tlsio_esp_at = (PENDING_TLS_IO*)singlylinkedlist_item_get_value(first_pending_io);
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| 199 | if (pending_tlsio_esp_at == NULL)
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| 200 | {
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| 201 | indicate_error(tlsio_esp_at_instance);
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| 202 | return -1;
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| 203 | }
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| 204 |
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| 205 | int send_result = esp_at_socket_send(tlsio_esp_at_instance->tcp_socket_connection, (const char*)pending_tlsio_esp_at->bytes, pending_tlsio_esp_at->size);
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| 206 | if (send_result != (int)pending_tlsio_esp_at->size)
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| 207 | {
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| 208 | if (send_result == 0)
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| 209 | {
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| 210 | // The underlying network layer may encounter hardware / environment issues,
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| 211 | // but the driver doesn't handle it properly. So here the send API always return 0,
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| 212 | // this causes the program running into dead loop if not check it here.
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| 213 | if (errors++ >= 10)
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| 214 | {
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| 215 | // Treat it as a network error after try 10 times.
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| 216 | LogError("Socketio_Failure: encountered unknow connection issue, the connection will be restarted.");
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| 217 | indicate_error(tlsio_esp_at_instance);
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| 218 | return -1;
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| 219 | }
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| 220 | ThreadAPI_Sleep(10);
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| 221 | }
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| 222 | else if (send_result < 0)
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| 223 | {
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| 224 | indicate_error(tlsio_esp_at_instance);
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| 225 | return -1;
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| 226 | }
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| 227 | else
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| 228 | {
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| 229 | /* send something, wait for the rest */
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| 230 | memmove(pending_tlsio_esp_at->bytes, pending_tlsio_esp_at->bytes + send_result, pending_tlsio_esp_at->size - send_result);
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| 231 | sent += send_result;
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| 232 | }
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| 233 | }
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| 234 | else
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| 235 | {
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| 236 | sent += send_result;
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| 237 | if (pending_tlsio_esp_at->on_send_complete != NULL)
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| 238 | {
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| 239 | pending_tlsio_esp_at->on_send_complete(pending_tlsio_esp_at->callback_context, IO_SEND_OK);
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| 240 | }
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| 241 |
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| 242 | free(pending_tlsio_esp_at->bytes);
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| 243 | free(pending_tlsio_esp_at);
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| 244 | if (singlylinkedlist_remove(tlsio_esp_at_instance->pending_io_list, first_pending_io) != 0)
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| 245 | {
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| 246 | indicate_error(tlsio_esp_at_instance);
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| 247 | return -1;
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| 248 | }
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| 249 | errors = 0;
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| 250 | }
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| 251 |
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| 252 | first_pending_io = singlylinkedlist_get_head_item(tlsio_esp_at_instance->pending_io_list);
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| 253 | }
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| 254 |
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| 255 | return sent;
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| 256 | }
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| 257 |
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| 258 | static void close_tcp_connection(TLS_IO_INSTANCE* tlsio_esp_at_instance)
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| 259 | {
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| 260 | if (tlsio_esp_at_instance->io_state != IO_STATE_CLOSED)
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| 261 | {
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| 262 | if (tlsio_esp_at_instance->tcp_socket_connection != NULL)
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| 263 | {
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| 264 | esp_at_socket_close(tlsio_esp_at_instance->tcp_socket_connection);
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| 265 | esp_at_socket_destroy(tlsio_esp_at_instance->tcp_socket_connection);
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| 266 | tlsio_esp_at_instance->tcp_socket_connection = NULL;
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| 267 | }
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| 268 | tlsio_esp_at_instance->io_state = IO_STATE_CLOSED;
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| 269 | }
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| 270 | }
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| 271 |
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| 272 | CONCRETE_IO_HANDLE tlsio_esp_at_create(void* io_create_parameters)
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| 273 | {
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| 274 | TLSIO_CONFIG* tlsio_esp_at_config = io_create_parameters;
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| 275 | TLS_IO_INSTANCE* result;
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| 276 |
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| 277 | if (tlsio_esp_at_config == NULL)
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| 278 | {
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| 279 | result = NULL;
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| 280 | }
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| 281 | else
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| 282 | {
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| 283 | result = (TLS_IO_INSTANCE*)malloc(sizeof(TLS_IO_INSTANCE));
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| 284 | if (result == NULL) {
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| 285 | LogError("Socketio_Failure: NULL allocating socket io instance.");
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| 286 | }
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| 287 | else
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| 288 | {
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| 289 | result->pending_io_list = singlylinkedlist_create();
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| 290 | if (result->pending_io_list == NULL)
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| 291 | {
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| 292 | free(result);
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| 293 | result = NULL;
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| 294 | }
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| 295 | else
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| 296 | {
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| 297 | result->hostname = strdup(tlsio_esp_at_config->hostname);
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| 298 | if (result->hostname == NULL)
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| 299 | {
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| 300 | singlylinkedlist_destroy(result->pending_io_list);
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| 301 | free(result);
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| 302 | result = NULL;
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| 303 | }
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| 304 | else
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| 305 | {
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| 306 | result->port = tlsio_esp_at_config->port;
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| 307 | result->on_bytes_received = NULL;
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| 308 | result->on_io_error = NULL;
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| 309 | result->on_bytes_received_context = NULL;
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| 310 | result->on_io_error_context = NULL;
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| 311 | result->io_state = IO_STATE_CLOSED;
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| 312 | result->tcp_socket_connection = NULL;
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| 313 | }
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| 314 | }
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| 315 | }
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| 316 | }
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| 317 |
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| 318 | return result;
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| 319 | }
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| 320 |
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| 321 | void tlsio_esp_at_destroy(CONCRETE_IO_HANDLE tlsio_esp_at)
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| 322 | {
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| 323 | if (tlsio_esp_at != NULL)
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| 324 | {
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| 325 | TLS_IO_INSTANCE* tlsio_esp_at_instance = (TLS_IO_INSTANCE*)tlsio_esp_at;
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| 326 |
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| 327 | // Close the tcp connection
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| 328 | close_tcp_connection(tlsio_esp_at_instance);
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| 329 |
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| 330 | // Clear all pending IOs
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| 331 | LIST_ITEM_HANDLE first_pending_io = singlylinkedlist_get_head_item(tlsio_esp_at_instance->pending_io_list);
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| 332 | while (first_pending_io != NULL)
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| 333 | {
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| 334 | PENDING_TLS_IO* pending_tlsio_esp_at = (PENDING_TLS_IO*)singlylinkedlist_item_get_value(first_pending_io);
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| 335 | if (pending_tlsio_esp_at != NULL)
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| 336 | {
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| 337 | free(pending_tlsio_esp_at->bytes);
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| 338 | free(pending_tlsio_esp_at);
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| 339 | }
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| 340 |
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| 341 | (void)singlylinkedlist_remove(tlsio_esp_at_instance->pending_io_list, first_pending_io);
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| 342 | first_pending_io = singlylinkedlist_get_head_item(tlsio_esp_at_instance->pending_io_list);
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| 343 | }
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| 344 | singlylinkedlist_destroy(tlsio_esp_at_instance->pending_io_list);
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| 345 |
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| 346 | if(tlsio_esp_at_instance->hostname != NULL)
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| 347 | {
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| 348 | free(tlsio_esp_at_instance->hostname);
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| 349 | tlsio_esp_at_instance->hostname = NULL;
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| 350 | }
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| 351 | free(tlsio_esp_at);
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| 352 | }
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| 353 | }
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| 354 |
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| 355 | int tlsio_esp_at_open(CONCRETE_IO_HANDLE tlsio_esp_at, ON_IO_OPEN_COMPLETE on_io_open_complete, void* on_io_open_complete_context, ON_BYTES_RECEIVED on_bytes_received, void* on_bytes_received_context, ON_IO_ERROR on_io_error, void* on_io_error_context)
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| 356 | {
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| 357 | int result;
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| 358 | TLS_IO_INSTANCE* tlsio_esp_at_instance = (TLS_IO_INSTANCE*)tlsio_esp_at;
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| 359 |
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| 360 |
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| 361 | if (tlsio_esp_at_instance == NULL ||
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| 362 | tlsio_esp_at_instance->io_state != IO_STATE_CLOSED)
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| 363 | {
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| 364 | result = MU_FAILURE;
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| 365 | }
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| 366 | else
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| 367 | {
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| 368 | tlsio_esp_at_instance->tcp_socket_connection = esp_at_socket_create(true);
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| 369 | if (tlsio_esp_at_instance->tcp_socket_connection == NULL)
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| 370 | {
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| 371 | result = MU_FAILURE;
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| 372 | }
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| 373 | else
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| 374 | {
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| 375 | if (esp_at_socket_connect(tlsio_esp_at_instance->tcp_socket_connection, tlsio_esp_at_instance->hostname, tlsio_esp_at_instance->port) != 0)
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| 376 | {
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| 377 | esp_at_socket_destroy(tlsio_esp_at_instance->tcp_socket_connection);
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| 378 | tlsio_esp_at_instance->tcp_socket_connection = NULL;
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| 379 | result = MU_FAILURE;
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| 380 | }
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| 381 | else
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| 382 | {
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| 383 | esp_at_socket_set_blocking(tlsio_esp_at_instance->tcp_socket_connection, false, 0);
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| 384 |
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| 385 | tlsio_esp_at_instance->on_bytes_received = on_bytes_received;
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| 386 | tlsio_esp_at_instance->on_bytes_received_context = on_bytes_received_context;
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| 387 |
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| 388 | tlsio_esp_at_instance->on_io_error = on_io_error;
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| 389 | tlsio_esp_at_instance->on_io_error_context = on_io_error_context;
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| 390 |
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| 391 | tlsio_esp_at_instance->io_state = IO_STATE_OPEN;
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| 392 |
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| 393 | result = 0;
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| 394 | }
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| 395 | }
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| 396 | }
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| 397 |
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| 398 | if (on_io_open_complete != NULL)
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| 399 | {
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| 400 | on_io_open_complete(on_io_open_complete_context, result == 0 ? IO_OPEN_OK : IO_OPEN_ERROR);
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| 401 | }
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| 402 |
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| 403 | return result;
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| 404 | }
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| 405 |
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| 406 | int tlsio_esp_at_close(CONCRETE_IO_HANDLE tlsio_esp_at, ON_IO_CLOSE_COMPLETE on_io_close_complete, void* callback_context)
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| 407 | {
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| 408 | int result = 0;
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| 409 |
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| 410 | if (tlsio_esp_at == NULL)
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| 411 | {
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| 412 | result = MU_FAILURE;
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| 413 | }
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| 414 | else
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| 415 | {
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| 416 | TLS_IO_INSTANCE* tlsio_esp_at_instance = (TLS_IO_INSTANCE*)tlsio_esp_at;
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| 417 | if (tlsio_esp_at_instance->io_state == IO_STATE_CLOSED ||
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| 418 | tlsio_esp_at_instance->io_state == IO_STATE_ERROR)
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| 419 | {
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| 420 | result = MU_FAILURE;
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| 421 | }
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| 422 | else
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| 423 | {
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| 424 | close_tcp_connection(tlsio_esp_at_instance);
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| 425 | if (on_io_close_complete != NULL)
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| 426 | {
|
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| 427 | on_io_close_complete(callback_context);
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| 428 | }
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| 429 | result = 0;
|
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| 430 | }
|
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| 431 | }
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| 432 |
|
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| 433 | return result;
|
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| 434 | }
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| 435 |
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| 436 | int tlsio_esp_at_send(CONCRETE_IO_HANDLE tlsio_esp_at, const void* buffer, size_t size, ON_SEND_COMPLETE on_send_complete, void* callback_context)
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| 437 | {
|
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| 438 | int result;
|
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| 439 |
|
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| 440 | if ((tlsio_esp_at == NULL) ||
|
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| 441 | (buffer == NULL) ||
|
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| 442 | (size == 0))
|
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| 443 | {
|
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| 444 | /* Invalid arguments */
|
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| 445 | result = MU_FAILURE;
|
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| 446 | }
|
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| 447 | else
|
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| 448 | {
|
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| 449 | result = 0;
|
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| 450 |
|
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| 451 | TLS_IO_INSTANCE* tlsio_esp_at_instance = (TLS_IO_INSTANCE*)tlsio_esp_at;
|
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| 452 | if (tlsio_esp_at_instance->io_state != IO_STATE_OPEN)
|
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| 453 | {
|
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| 454 | result = MU_FAILURE;
|
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| 455 | }
|
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| 456 | else
|
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| 457 | {
|
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| 458 | // Queue the data, and the tlsio_esp_at_dowork sends the package later
|
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| 459 | if (add_pending_io(tlsio_esp_at_instance, buffer, size, on_send_complete, callback_context) != 0)
|
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| 460 | {
|
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| 461 | result = MU_FAILURE;
|
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| 462 | }
|
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| 463 | }
|
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| 464 | }
|
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| 465 |
|
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| 466 | return result;
|
---|
| 467 | }
|
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| 468 |
|
---|
| 469 | void tlsio_esp_at_dowork(CONCRETE_IO_HANDLE tlsio_esp_at)
|
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| 470 | {
|
---|
| 471 | if (tlsio_esp_at != NULL)
|
---|
| 472 | {
|
---|
| 473 | TLS_IO_INSTANCE* tlsio_esp_at_instance = (TLS_IO_INSTANCE*)tlsio_esp_at;
|
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| 474 | if (tlsio_esp_at_instance->io_state == IO_STATE_OPEN)
|
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| 475 | {
|
---|
| 476 | // Retrieve all data from IoT Hub
|
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| 477 | if (retrieve_data(tlsio_esp_at_instance) < 0)
|
---|
| 478 | {
|
---|
| 479 | return;
|
---|
| 480 | }
|
---|
| 481 |
|
---|
| 482 | // Send all packages in the queue
|
---|
| 483 | send_queued_data(tlsio_esp_at_instance);
|
---|
| 484 | }
|
---|
| 485 | }
|
---|
| 486 | }
|
---|
| 487 |
|
---|
| 488 | int tlsio_esp_at_setoption(CONCRETE_IO_HANDLE tlsio_esp_at, const char* optionName, const void* value)
|
---|
| 489 | {
|
---|
| 490 | /* Not implementing any options, do nothing */
|
---|
| 491 | return OPTIONHANDLER_OK;
|
---|
| 492 | }
|
---|
| 493 |
|
---|
| 494 | const IO_INTERFACE_DESCRIPTION* tlsio_esp_at_get_interface_description(void)
|
---|
| 495 | {
|
---|
| 496 | return &tlsio_esp_at_interface_description;
|
---|
| 497 | }
|
---|