1 | // The MIT License (MIT)
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2 | //
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3 | // Copyright (c) 2015 Adafruit Industries
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4 | //
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5 | // Permission is hereby granted, free of charge, to any person obtaining a copy
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6 | // of this software and associated documentation files (the "Software"), to deal
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7 | // in the Software without restriction, including without limitation the rights
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8 | // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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9 | // copies of the Software, and to permit persons to whom the Software is
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10 | // furnished to do so, subject to the following conditions:
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11 | //
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12 | // The above copyright notice and this permission notice shall be included in all
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13 | // copies or substantial portions of the Software.
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14 | //
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15 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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16 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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17 | // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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18 | // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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19 | // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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20 | // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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21 | // SOFTWARE.
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22 | #ifndef _ADAFRUIT_MQTT_FONA_H_
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23 | #define _ADAFRUIT_MQTT_FONA_H_
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24 |
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25 | #include <Adafruit_FONA.h>
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26 | #include "Adafruit_MQTT.h"
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27 |
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28 | #define MQTT_FONA_INTERAVAILDELAY 100
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29 | #define MQTT_FONA_QUERYDELAY 500
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30 |
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31 |
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32 | // FONA-specific version of the Adafruit_MQTT class.
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33 | // Note that this is defined as a header-only class to prevent issues with using
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34 | // the library on non-FONA platforms (since Arduino will include all .cpp files
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35 | // in the compilation of the library).
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36 | class Adafruit_MQTT_FONA : public Adafruit_MQTT {
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37 | public:
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38 | Adafruit_MQTT_FONA(Adafruit_FONA *f, const char *server, uint16_t port,
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39 | const char *cid, const char *user, const char *pass):
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40 | Adafruit_MQTT(server, port, cid, user, pass),
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41 | fona(f)
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42 | {}
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43 |
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44 | bool connectServer() {
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45 | char server[40];
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46 | strncpy_P(server, servername, 40);
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47 | Watchdog.reset();
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48 |
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49 | // connect to server
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50 | DEBUG_PRINTLN(F("Connecting to TCP"));
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51 | return fona->TCPconnect(server, portnum);
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52 | }
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53 |
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54 | bool disconnect() {
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55 | return fona->TCPclose();
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56 | }
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57 |
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58 | bool connected() {
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59 | // Return true if connected, false if not connected.
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60 | return fona->TCPconnected();
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61 | }
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62 |
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63 | uint16_t readPacket(uint8_t *buffer, uint8_t maxlen, int16_t timeout,
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64 | bool checkForValidPubPacket = false) {
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65 | uint8_t *buffp = buffer;
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66 | DEBUG_PRINTLN(F("Reading a packet.."));
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67 |
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68 | if (!fona->TCPconnected()) return 0;
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69 |
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70 |
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71 | /* Read data until either the connection is closed, or the idle timeout is reached. */
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72 | uint16_t len = 0;
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73 | int16_t t = timeout;
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74 | uint16_t avail;
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75 |
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76 | while (fona->TCPconnected() && (timeout >= 0)) {
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77 | DEBUG_PRINT('.');
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78 | while (avail = fona->TCPavailable()) {
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79 | DEBUG_PRINT('!');
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80 |
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81 | if (len + avail > maxlen) {
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82 | avail = maxlen - len;
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83 | if (avail == 0) return len;
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84 | }
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85 |
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86 | // try to read the data into the end of the pointer
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87 | if (! fona->TCPread(buffp, avail)) return len;
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88 |
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89 | // read it! advance pointer
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90 | buffp += avail;
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91 | len += avail;
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92 | timeout = t; // reset the timeout
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93 |
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94 | //DEBUG_PRINTLN((uint8_t)c, HEX);
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95 |
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96 | if (len == maxlen) { // we read all we want, bail
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97 | DEBUG_PRINT(F("Read packet:\t"));
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98 | DEBUG_PRINTBUFFER(buffer, len);
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99 | return len;
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100 | }
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101 |
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102 | // special case where we just one one publication packet at a time
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103 | if (checkForValidPubPacket) {
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104 | if ((buffer[0] == (MQTT_CTRL_PUBLISH << 4)) && (buffer[1] == len-2)) {
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105 | // oooh a valid publish packet!
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106 | DEBUG_PRINT(F("Read PUBLISH packet:\t"));
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107 | DEBUG_PRINTBUFFER(buffer, len);
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108 | return len;
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109 | }
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110 | }
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111 |
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112 | }
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113 | Watchdog.reset();
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114 | timeout -= MQTT_FONA_INTERAVAILDELAY;
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115 | timeout -= MQTT_FONA_QUERYDELAY; // this is how long it takes to query the FONA for avail()
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116 | delay(MQTT_FONA_INTERAVAILDELAY);
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117 | }
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118 |
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119 | return len;
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120 | }
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121 |
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122 | bool sendPacket(uint8_t *buffer, uint8_t len) {
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123 | DEBUG_PRINTLN(F("Writing packet"));
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124 | if (fona->TCPconnected()) {
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125 | boolean ret = fona->TCPsend((char *)buffer, len);
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126 | //DEBUG_PRINT(F("sendPacket returned: ")); DEBUG_PRINTLN(ret);
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127 | if (!ret) {
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128 | DEBUG_PRINTLN("Failed to send packet.")
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129 | return false;
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130 | }
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131 | } else {
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132 | DEBUG_PRINTLN(F("Connection failed!"));
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133 | return false;
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134 | }
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135 | return true;
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136 | }
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137 |
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138 | private:
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139 | uint32_t serverip;
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140 | Adafruit_FONA *fona;
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141 | };
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142 |
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143 |
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144 | #endif
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