Doug Anson / MQTT-ansond

Initial port of the Arduino MQTT Client: http://knolleary.net/arduino-client-for-mqtt/ Updated with larger timeout and buffer sizes

Dependents:   mbed_mqtt_endpoint_ublox_ethernet mbed_mqtt_endpoint_ublox_cellular mbed_mqtt_endpoint_nxp

Fork of MQTT by Joerg Wende

PubSubClient.cpp@0:ca855d29545b, 2013-05-26 (annotated)

Committer:
jwende
Date:
Sun May 26 16:52:01 2013 +0000
Revision:
0:ca855d29545b
Child:
7:9e005abd6846
PubSubClient Library developed for Arduino - http://knolleary.net/arduino-client-for-mqtt/; Initial port to mbed using EthernetInterface

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jwende 0:ca855d29545b 1 /*
jwende 0:ca855d29545b 2 PubSubClient.cpp - A simple client for MQTT.
jwende 0:ca855d29545b 3 Nicholas O'Leary
jwende 0:ca855d29545b 4 http://knolleary.net
jwende 0:ca855d29545b 5
jwende 0:ca855d29545b 6 initial port for mbed
jwende 0:ca855d29545b 7 Joerg Wende
jwende 0:ca855d29545b 8 https://twitter.com/joerg_wende
jwende 0:ca855d29545b 9 */
jwende 0:ca855d29545b 10
jwende 0:ca855d29545b 11 #include "PubSubClient.h"
jwende 0:ca855d29545b 12
jwende 0:ca855d29545b 13 Timer t;
jwende 0:ca855d29545b 14 //Serial pc1(USBTX, USBRX);
jwende 0:ca855d29545b 15
jwende 0:ca855d29545b 16
jwende 0:ca855d29545b 17 int millis()
jwende 0:ca855d29545b 18 {
jwende 0:ca855d29545b 19 return t.read_ms();
jwende 0:ca855d29545b 20 }
jwende 0:ca855d29545b 21
jwende 0:ca855d29545b 22 PubSubClient::PubSubClient()
jwende 0:ca855d29545b 23 {
jwende 0:ca855d29545b 24 }
jwende 0:ca855d29545b 25
jwende 0:ca855d29545b 26 PubSubClient::PubSubClient(char *ip, int port, void (*callback)(char*,char*,unsigned int))
jwende 0:ca855d29545b 27 {
jwende 0:ca855d29545b 28 this->callback = callback;
jwende 0:ca855d29545b 29 this->ip = ip;
jwende 0:ca855d29545b 30 this->port = port;
jwende 0:ca855d29545b 31 t.start();
jwende 0:ca855d29545b 32 }
jwende 0:ca855d29545b 33
jwende 0:ca855d29545b 34
jwende 0:ca855d29545b 35 bool PubSubClient::connect(char *id)
jwende 0:ca855d29545b 36 {
jwende 0:ca855d29545b 37 return connect(id,NULL,NULL,0,0,0,0);
jwende 0:ca855d29545b 38 }
jwende 0:ca855d29545b 39
jwende 0:ca855d29545b 40 bool PubSubClient::connect(char *id, char *user, char *pass)
jwende 0:ca855d29545b 41 {
jwende 0:ca855d29545b 42 return connect(id,user,pass,0,0,0,0);
jwende 0:ca855d29545b 43 }
jwende 0:ca855d29545b 44
jwende 0:ca855d29545b 45 bool PubSubClient::connect(char *id, char* willTopic, short willQos, short willRetain, char* willMessage)
jwende 0:ca855d29545b 46 {
jwende 0:ca855d29545b 47 return connect(id,NULL,NULL,willTopic,willQos,willRetain,willMessage);
jwende 0:ca855d29545b 48 }
jwende 0:ca855d29545b 49
jwende 0:ca855d29545b 50 bool PubSubClient::connect(char *id, char *user, char *pass, char* willTopic, short willQos, short willRetain, char* willMessage)
jwende 0:ca855d29545b 51 {
jwende 0:ca855d29545b 52 if (!connected()) {
jwende 0:ca855d29545b 53 int result = 0;
jwende 0:ca855d29545b 54 result = _client.connect(this->ip, this->port);
jwende 0:ca855d29545b 55 _client.set_blocking(false, 1);
jwende 0:ca855d29545b 56 //pc1.printf("IP: %s\r\n",this->ip);
jwende 0:ca855d29545b 57 //pc1.printf("Port: %i\r\n",this->port);
jwende 0:ca855d29545b 58 //pc1.printf("Result: %i \r\n", result);
jwende 0:ca855d29545b 59
jwende 0:ca855d29545b 60 if (result==0) {
jwende 0:ca855d29545b 61 nextMsgId = 1;
jwende 0:ca855d29545b 62 char d[9] = {0x00,0x06,'M','Q','I','s','d','p',MQTTPROTOCOLVERSION};
jwende 0:ca855d29545b 63 // Leave room in the buffer for header and variable length field
jwende 0:ca855d29545b 64 int length = 5;
jwende 0:ca855d29545b 65 unsigned int j;
jwende 0:ca855d29545b 66 for (j = 0; j<9; j++) {
jwende 0:ca855d29545b 67 buffer[length++] = d[j];
jwende 0:ca855d29545b 68 }
jwende 0:ca855d29545b 69
jwende 0:ca855d29545b 70 char v;
jwende 0:ca855d29545b 71 if (willTopic) {
jwende 0:ca855d29545b 72 v = 0x06|(willQos<<3)|(willRetain<<5);
jwende 0:ca855d29545b 73 } else {
jwende 0:ca855d29545b 74 v = 0x02;
jwende 0:ca855d29545b 75 }
jwende 0:ca855d29545b 76
jwende 0:ca855d29545b 77 if(user != NULL) {
jwende 0:ca855d29545b 78 v = v|0x80;
jwende 0:ca855d29545b 79
jwende 0:ca855d29545b 80 if(pass != NULL) {
jwende 0:ca855d29545b 81 v = v|(0x80>>1);
jwende 0:ca855d29545b 82 }
jwende 0:ca855d29545b 83 }
jwende 0:ca855d29545b 84
jwende 0:ca855d29545b 85 buffer[length++] = v;
jwende 0:ca855d29545b 86
jwende 0:ca855d29545b 87 buffer[length++] = ((MQTT_KEEPALIVE) >> 8);
jwende 0:ca855d29545b 88 buffer[length++] = ((MQTT_KEEPALIVE) & 0xFF);
jwende 0:ca855d29545b 89 length = writeString(id,buffer,length);
jwende 0:ca855d29545b 90 if (willTopic) {
jwende 0:ca855d29545b 91 length = writeString(willTopic,buffer,length);
jwende 0:ca855d29545b 92 length = writeString(willMessage,buffer,length);
jwende 0:ca855d29545b 93 }
jwende 0:ca855d29545b 94
jwende 0:ca855d29545b 95 if(user != NULL) {
jwende 0:ca855d29545b 96 length = writeString(user,buffer,length);
jwende 0:ca855d29545b 97 if(pass != NULL) {
jwende 0:ca855d29545b 98 length = writeString(pass,buffer,length);
jwende 0:ca855d29545b 99 }
jwende 0:ca855d29545b 100 }
jwende 0:ca855d29545b 101 //pc1.printf("Before MQTT Connect ... \r\n");
jwende 0:ca855d29545b 102 write(MQTTCONNECT,buffer,length-5);
jwende 0:ca855d29545b 103
jwende 0:ca855d29545b 104 lastInActivity = lastOutActivity = millis();
jwende 0:ca855d29545b 105
jwende 0:ca855d29545b 106 int llen=128;
jwende 0:ca855d29545b 107 int len =0;
jwende 0:ca855d29545b 108
jwende 0:ca855d29545b 109 while ((len=readPacket(llen))==0) {
jwende 0:ca855d29545b 110 unsigned long t = millis();
jwende 0:ca855d29545b 111 if (t-lastInActivity > MQTT_KEEPALIVE*1000UL) {
jwende 0:ca855d29545b 112 _client.close(true);
jwende 0:ca855d29545b 113 return false;
jwende 0:ca855d29545b 114 }
jwende 0:ca855d29545b 115 }
jwende 0:ca855d29545b 116 //pc1.printf("after MQTT Connect ... %i\r\n",len);
jwende 0:ca855d29545b 117 if (len == 4 && buffer[3] == 0) {
jwende 0:ca855d29545b 118 lastInActivity = millis();
jwende 0:ca855d29545b 119 pingOutstanding = false;
jwende 0:ca855d29545b 120 return true;
jwende 0:ca855d29545b 121 }
jwende 0:ca855d29545b 122 }
jwende 0:ca855d29545b 123 _client.close(true);
jwende 0:ca855d29545b 124 }
jwende 0:ca855d29545b 125 return false;
jwende 0:ca855d29545b 126 }
jwende 0:ca855d29545b 127
jwende 0:ca855d29545b 128
jwende 0:ca855d29545b 129 int PubSubClient::readPacket(int lengthLength)
jwende 0:ca855d29545b 130 {
jwende 0:ca855d29545b 131 int len = 0;
jwende 0:ca855d29545b 132 len = _client.receive_all(buffer,lengthLength);
jwende 0:ca855d29545b 133 return len;
jwende 0:ca855d29545b 134 }
jwende 0:ca855d29545b 135
jwende 0:ca855d29545b 136 bool PubSubClient::loop()
jwende 0:ca855d29545b 137 {
jwende 0:ca855d29545b 138 if (connected()) {
jwende 0:ca855d29545b 139 unsigned long t = millis();
jwende 0:ca855d29545b 140 if ((t - lastInActivity > MQTT_KEEPALIVE*1000UL) || (t - lastOutActivity > MQTT_KEEPALIVE*1000UL)) {
jwende 0:ca855d29545b 141 if (pingOutstanding) {
jwende 0:ca855d29545b 142 _client.close(true);
jwende 0:ca855d29545b 143 return false;
jwende 0:ca855d29545b 144 } else {
jwende 0:ca855d29545b 145 buffer[0] = MQTTPINGREQ;
jwende 0:ca855d29545b 146 buffer[1] = 0;
jwende 0:ca855d29545b 147 _client.send(buffer,2);
jwende 0:ca855d29545b 148 lastOutActivity = t;
jwende 0:ca855d29545b 149 lastInActivity = t;
jwende 0:ca855d29545b 150 pingOutstanding = true;
jwende 0:ca855d29545b 151 }
jwende 0:ca855d29545b 152 }
jwende 0:ca855d29545b 153 int len;
jwende 0:ca855d29545b 154 int llen= 128;
jwende 0:ca855d29545b 155 if (!((len=readPacket(llen))==0)) {
jwende 0:ca855d29545b 156 if (len > 0) {
jwende 0:ca855d29545b 157 lastInActivity = t;
jwende 0:ca855d29545b 158 char type = buffer[0]&0xF0;
jwende 0:ca855d29545b 159 if (type == MQTTPUBLISH) {
jwende 0:ca855d29545b 160 if (callback) {
jwende 0:ca855d29545b 161 //pc1.printf("MQTTPUBLISH received ... %i\r\n",len);
jwende 0:ca855d29545b 162 int tl = (buffer[2]<<8)+buffer[3];
jwende 0:ca855d29545b 163 //pc1.printf("t1 ... %i\r\n",tl);
jwende 0:ca855d29545b 164 char topic[tl+1];
jwende 0:ca855d29545b 165 for (int i=0; i<tl; i++) {
jwende 0:ca855d29545b 166 topic[i] = buffer[4+i];
jwende 0:ca855d29545b 167 }
jwende 0:ca855d29545b 168 topic[tl] = 0;
jwende 0:ca855d29545b 169 //pc1.printf("MQTTPUBLISH Topic ... %s\r\n",topic);
jwende 0:ca855d29545b 170 // ignore msgID - only support QoS 0 subs
jwende 0:ca855d29545b 171 int t2 = len-4-tl;
jwende 0:ca855d29545b 172 //pc1.printf("t2 ... %i\r\n",t2);
jwende 0:ca855d29545b 173 char payload[t2+1];
jwende 0:ca855d29545b 174 for (int i=0; i<t2; i++) {
jwende 0:ca855d29545b 175 payload[i] = buffer[4+i+tl];
jwende 0:ca855d29545b 176 }
jwende 0:ca855d29545b 177 payload[t2] = 0;
jwende 0:ca855d29545b 178 //pc1.printf("MQTTPUBLISH Payload ... %s\r\n",payload);
jwende 0:ca855d29545b 179 callback(topic,payload,t2);
jwende 0:ca855d29545b 180 }
jwende 0:ca855d29545b 181 } else if (type == MQTTPINGREQ) {
jwende 0:ca855d29545b 182 buffer[0] = MQTTPINGRESP;
jwende 0:ca855d29545b 183 buffer[1] = 0;
jwende 0:ca855d29545b 184 _client.send(buffer,2);
jwende 0:ca855d29545b 185 } else if (type == MQTTPINGRESP) {
jwende 0:ca855d29545b 186 pingOutstanding = false;
jwende 0:ca855d29545b 187 }
jwende 0:ca855d29545b 188 }
jwende 0:ca855d29545b 189 }
jwende 0:ca855d29545b 190 return true;
jwende 0:ca855d29545b 191 }
jwende 0:ca855d29545b 192 return false;
jwende 0:ca855d29545b 193 }
jwende 0:ca855d29545b 194
jwende 0:ca855d29545b 195 bool PubSubClient::publish(char* topic, char* payload)
jwende 0:ca855d29545b 196 {
jwende 0:ca855d29545b 197 return publish(topic,payload,strlen(payload),false);
jwende 0:ca855d29545b 198 }
jwende 0:ca855d29545b 199
jwende 0:ca855d29545b 200 bool PubSubClient::publish(char* topic, char* payload, unsigned int plength)
jwende 0:ca855d29545b 201 {
jwende 0:ca855d29545b 202 return publish(topic, payload, plength, false);
jwende 0:ca855d29545b 203 }
jwende 0:ca855d29545b 204
jwende 0:ca855d29545b 205 bool PubSubClient::publish(char* topic, char* payload, unsigned int plength, bool retained)
jwende 0:ca855d29545b 206 {
jwende 0:ca855d29545b 207 if (connected()) {
jwende 0:ca855d29545b 208 // Leave room in the buffer for header and variable length field
jwende 0:ca855d29545b 209 //pc1.printf("in publish ... %s\r\n",topic);
jwende 0:ca855d29545b 210 //pc1.printf("in publish ... %s\r\n",payload);
jwende 0:ca855d29545b 211 int length = 5;
jwende 0:ca855d29545b 212 length = writeString(topic,buffer,length);
jwende 0:ca855d29545b 213 int i;
jwende 0:ca855d29545b 214 for (i=0; i<plength; i++) {
jwende 0:ca855d29545b 215 buffer[length++] = payload[i];
jwende 0:ca855d29545b 216 }
jwende 0:ca855d29545b 217 short header = MQTTPUBLISH;
jwende 0:ca855d29545b 218 if (retained) {
jwende 0:ca855d29545b 219 header |= 1;
jwende 0:ca855d29545b 220 }
jwende 0:ca855d29545b 221 return write(header,buffer,length-5);
jwende 0:ca855d29545b 222 }
jwende 0:ca855d29545b 223 return false;
jwende 0:ca855d29545b 224 }
jwende 0:ca855d29545b 225
jwende 0:ca855d29545b 226
jwende 0:ca855d29545b 227
jwende 0:ca855d29545b 228 bool PubSubClient::write(short header, char* buf, int length)
jwende 0:ca855d29545b 229 {
jwende 0:ca855d29545b 230 short lenBuf[4];
jwende 0:ca855d29545b 231 short llen = 0;
jwende 0:ca855d29545b 232 short digit;
jwende 0:ca855d29545b 233 short pos = 0;
jwende 0:ca855d29545b 234 short rc;
jwende 0:ca855d29545b 235 short len = length;
jwende 0:ca855d29545b 236 //pc1.printf("in write ... %d\r\n",length);
jwende 0:ca855d29545b 237 //pc1.printf("in write ... %s\r\n",buf);
jwende 0:ca855d29545b 238 do {
jwende 0:ca855d29545b 239 digit = len % 128;
jwende 0:ca855d29545b 240 len = len / 128;
jwende 0:ca855d29545b 241 if (len > 0) {
jwende 0:ca855d29545b 242 digit |= 0x80;
jwende 0:ca855d29545b 243 }
jwende 0:ca855d29545b 244 lenBuf[pos++] = digit;
jwende 0:ca855d29545b 245 llen++;
jwende 0:ca855d29545b 246 } while(len>0);
jwende 0:ca855d29545b 247
jwende 0:ca855d29545b 248 buf[4-llen] = header;
jwende 0:ca855d29545b 249 for (int i=0; i<llen; i++) {
jwende 0:ca855d29545b 250 buf[5-llen+i] = lenBuf[i];
jwende 0:ca855d29545b 251 }
jwende 0:ca855d29545b 252 rc = _client.send(buf+(4-llen),length+1+llen);
jwende 0:ca855d29545b 253
jwende 0:ca855d29545b 254 lastOutActivity = millis();
jwende 0:ca855d29545b 255 return (rc == 1+llen+length);
jwende 0:ca855d29545b 256 }
jwende 0:ca855d29545b 257
jwende 0:ca855d29545b 258 bool PubSubClient::subscribe(char* topic)
jwende 0:ca855d29545b 259 {
jwende 0:ca855d29545b 260 //pc1.printf("in subscribe ... %s\r\n",topic);
jwende 0:ca855d29545b 261 if (connected()) {
jwende 0:ca855d29545b 262 // Leave room in the buffer for header and variable length field
jwende 0:ca855d29545b 263 int length = 5;
jwende 0:ca855d29545b 264 nextMsgId++;
jwende 0:ca855d29545b 265 if (nextMsgId == 0) {
jwende 0:ca855d29545b 266 nextMsgId = 1;
jwende 0:ca855d29545b 267 }
jwende 0:ca855d29545b 268 buffer[length++] = (nextMsgId >> 8);
jwende 0:ca855d29545b 269 buffer[length++] = (nextMsgId & 0xFF);
jwende 0:ca855d29545b 270 length = writeString(topic, buffer,length);
jwende 0:ca855d29545b 271 buffer[length++] = 0; // Only do QoS 0 subs
jwende 0:ca855d29545b 272 return write(MQTTSUBSCRIBE|MQTTQOS1,buffer,length-5);
jwende 0:ca855d29545b 273 }
jwende 0:ca855d29545b 274 return false;
jwende 0:ca855d29545b 275 }
jwende 0:ca855d29545b 276
jwende 0:ca855d29545b 277 bool PubSubClient::unsubscribe(char* topic)
jwende 0:ca855d29545b 278 {
jwende 0:ca855d29545b 279 if (connected()) {
jwende 0:ca855d29545b 280 int length = 5;
jwende 0:ca855d29545b 281 nextMsgId++;
jwende 0:ca855d29545b 282 if (nextMsgId == 0) {
jwende 0:ca855d29545b 283 nextMsgId = 1;
jwende 0:ca855d29545b 284 }
jwende 0:ca855d29545b 285 buffer[length++] = (nextMsgId >> 8);
jwende 0:ca855d29545b 286 buffer[length++] = (nextMsgId & 0xFF);
jwende 0:ca855d29545b 287 length = writeString(topic, buffer,length);
jwende 0:ca855d29545b 288 return write(MQTTUNSUBSCRIBE|MQTTQOS1,buffer,length-5);
jwende 0:ca855d29545b 289 }
jwende 0:ca855d29545b 290 return false;
jwende 0:ca855d29545b 291 }
jwende 0:ca855d29545b 292
jwende 0:ca855d29545b 293 void PubSubClient::disconnect()
jwende 0:ca855d29545b 294 {
jwende 0:ca855d29545b 295 buffer[0] = MQTTDISCONNECT;
jwende 0:ca855d29545b 296 buffer[1] = 0;
jwende 0:ca855d29545b 297 _client.send(buffer,2);
jwende 0:ca855d29545b 298 _client.close(true);
jwende 0:ca855d29545b 299 lastInActivity = lastOutActivity = millis();
jwende 0:ca855d29545b 300 }
jwende 0:ca855d29545b 301
jwende 0:ca855d29545b 302 int PubSubClient::writeString(char* string, char* buf, int pos)
jwende 0:ca855d29545b 303 {
jwende 0:ca855d29545b 304 char* idp = string;
jwende 0:ca855d29545b 305 int i = 0;
jwende 0:ca855d29545b 306 pos += 2;
jwende 0:ca855d29545b 307 while (*idp) {
jwende 0:ca855d29545b 308 buf[pos++] = *idp++;
jwende 0:ca855d29545b 309 i++;
jwende 0:ca855d29545b 310 }
jwende 0:ca855d29545b 311 buf[pos-i-2] = (i >> 8);
jwende 0:ca855d29545b 312 buf[pos-i-1] = (i & 0xFF);
jwende 0:ca855d29545b 313 return pos;
jwende 0:ca855d29545b 314 }
jwende 0:ca855d29545b 315
jwende 0:ca855d29545b 316
jwende 0:ca855d29545b 317 bool PubSubClient::connected()
jwende 0:ca855d29545b 318 {
jwende 0:ca855d29545b 319 bool rc;
jwende 0:ca855d29545b 320 rc = (int)_client.is_connected();
jwende 0:ca855d29545b 321 if (!rc) _client.close(true);
jwende 0:ca855d29545b 322 return rc;
jwende 0:ca855d29545b 323 }