[224] | 1 | /*
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| 2 | EthernetClientStream.cpp
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| 3 | An Arduino-Stream that wraps an instance of Client reconnecting to
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| 4 | the remote-ip in a transparent way. A disconnected client may be
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| 5 | recognized by the returnvalues -1 from calls to peek or read and
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| 6 | a 0 from calls to write.
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| 7 |
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| 8 | Copyright (C) 2013 Norbert Truchsess. All rights reserved.
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| 9 |
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| 10 | This library is free software; you can redistribute it and/or
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| 11 | modify it under the terms of the GNU Lesser General Public
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| 12 | License as published by the Free Software Foundation; either
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| 13 | version 2.1 of the License, or (at your option) any later version.
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| 14 |
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| 15 | See file LICENSE.txt for further informations on licensing terms.
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| 16 |
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| 17 | formatted using the GNU C formatting and indenting
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| 18 | */
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| 19 |
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| 20 | #include "EthernetClientStream.h"
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| 21 | #include <Arduino.h>
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| 22 |
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| 23 | //#define SERIAL_DEBUG
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| 24 | #include "firmataDebug.h"
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| 25 |
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| 26 | #define MILLIS_RECONNECT 5000
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| 27 |
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| 28 | EthernetClientStream::EthernetClientStream(Client &client, IPAddress localip, IPAddress ip, const char* host, uint16_t port)
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| 29 | : client(client),
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| 30 | localip(localip),
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| 31 | ip(ip),
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| 32 | host(host),
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| 33 | port(port),
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| 34 | connected(false)
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| 35 | {
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| 36 | }
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| 37 |
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| 38 | int
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| 39 | EthernetClientStream::available()
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| 40 | {
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| 41 | return maintain() ? client.available() : 0;
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| 42 | }
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| 43 |
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| 44 | int
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| 45 | EthernetClientStream::read()
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| 46 | {
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| 47 | return maintain() ? client.read() : -1;
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| 48 | }
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| 49 |
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| 50 | int
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| 51 | EthernetClientStream::peek()
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| 52 | {
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| 53 | return maintain() ? client.peek() : -1;
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| 54 | }
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| 55 |
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| 56 | void EthernetClientStream::flush()
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| 57 | {
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| 58 | if (maintain())
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| 59 | client.flush();
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| 60 | }
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| 61 |
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| 62 | size_t
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| 63 | EthernetClientStream::write(uint8_t c)
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| 64 | {
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| 65 | return maintain() ? client.write(c) : 0;
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| 66 | }
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| 67 |
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| 68 | void
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| 69 | EthernetClientStream::maintain(IPAddress localip)
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| 70 | {
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| 71 | // temporary hack to Firmata to compile for Intel Galileo
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| 72 | // the issue is documented here: https://github.com/firmata/arduino/issues/218
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| 73 | #if !defined(ARDUINO_LINUX)
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| 74 | // ensure the local IP is updated in the case that it is changed by the DHCP server
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| 75 | if (this->localip != localip)
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| 76 | {
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| 77 | this->localip = localip;
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| 78 | if (connected)
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| 79 | stop();
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| 80 | }
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| 81 | #endif
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| 82 | }
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| 83 |
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| 84 | void
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| 85 | EthernetClientStream::stop()
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| 86 | {
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| 87 | client.stop();
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| 88 | connected = false;
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| 89 | time_connect = millis();
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| 90 | }
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| 91 |
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| 92 | bool
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| 93 | EthernetClientStream::maintain()
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| 94 | {
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| 95 | if (client && client.connected())
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| 96 | return true;
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| 97 |
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| 98 | if (connected)
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| 99 | {
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| 100 | stop();
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| 101 | }
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| 102 | // if the client is disconnected, attempt to reconnect every 5 seconds
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| 103 | else if (millis()-time_connect >= MILLIS_RECONNECT)
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| 104 | {
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| 105 | connected = host ? client.connect(host, port) : client.connect(ip, port);
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| 106 | if (!connected) {
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| 107 | time_connect = millis();
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| 108 | DEBUG_PRINTLN("connection failed. attempting to reconnect...");
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| 109 | } else {
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| 110 | DEBUG_PRINTLN("connected");
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| 111 | }
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| 112 | }
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| 113 | return connected;
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| 114 | }
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