Nilesh Vora / Yalgaar

Yalgaar mBed SDK for real-time messaging

Dependents:   YalgaarSDK

Fork of MQTT by Joerg Wende

PubSubClient.cpp@1:c233cee7c15b, 2017-03-10 (annotated)

Committer:
nileshvora
Date:
Fri Mar 10 13:11:49 2017 +0000
Revision:
1:c233cee7c15b
Parent:
0:ca855d29545b
Child:
3:511121ab8fef
Yalgaar SDK V:1.0

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
nileshvora 1:c233cee7c15b 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
nileshvora 1:c233cee7c15b 13
jwende 0:ca855d29545b 14
jwende 0:ca855d29545b 15
nileshvora 1:c233cee7c15b 16 Serial pc1(USBTX, USBRX, 115200);
nileshvora 1:c233cee7c15b 17
nileshvora 1:c233cee7c15b 18 int pubsub_error_code;
nileshvora 1:c233cee7c15b 19
nileshvora 1:c233cee7c15b 20
nileshvora 1:c233cee7c15b 21 int PubSubClient::millis()
jwende 0:ca855d29545b 22 {
jwende 0:ca855d29545b 23 return t.read_ms();
jwende 0:ca855d29545b 24 }
jwende 0:ca855d29545b 25
jwende 0:ca855d29545b 26 PubSubClient::PubSubClient()
jwende 0:ca855d29545b 27 {
jwende 0:ca855d29545b 28 }
jwende 0:ca855d29545b 29
nileshvora 1:c233cee7c15b 30 PubSubClient::PubSubClient(char *ip, int port)
jwende 0:ca855d29545b 31 {
nileshvora 1:c233cee7c15b 32 this->_state = MQTT_DISCONNECTED;
jwende 0:ca855d29545b 33 this->ip = ip;
jwende 0:ca855d29545b 34 this->port = port;
nileshvora 1:c233cee7c15b 35 this->t.start();
jwende 0:ca855d29545b 36 }
jwende 0:ca855d29545b 37
jwende 0:ca855d29545b 38
jwende 0:ca855d29545b 39 bool PubSubClient::connect(char *id)
jwende 0:ca855d29545b 40 {
jwende 0:ca855d29545b 41 return connect(id,NULL,NULL,0,0,0,0);
jwende 0:ca855d29545b 42 }
jwende 0:ca855d29545b 43
jwende 0:ca855d29545b 44 bool PubSubClient::connect(char *id, char *user, char *pass)
jwende 0:ca855d29545b 45 {
jwende 0:ca855d29545b 46 return connect(id,user,pass,0,0,0,0);
jwende 0:ca855d29545b 47 }
jwende 0:ca855d29545b 48
jwende 0:ca855d29545b 49 bool PubSubClient::connect(char *id, char* willTopic, short willQos, short willRetain, char* willMessage)
jwende 0:ca855d29545b 50 {
jwende 0:ca855d29545b 51 return connect(id,NULL,NULL,willTopic,willQos,willRetain,willMessage);
jwende 0:ca855d29545b 52 }
jwende 0:ca855d29545b 53
jwende 0:ca855d29545b 54 bool PubSubClient::connect(char *id, char *user, char *pass, char* willTopic, short willQos, short willRetain, char* willMessage)
jwende 0:ca855d29545b 55 {
jwende 0:ca855d29545b 56 if (!connected()) {
jwende 0:ca855d29545b 57 int result = 0;
jwende 0:ca855d29545b 58 result = _client.connect(this->ip, this->port);
jwende 0:ca855d29545b 59 _client.set_blocking(false, 1);
jwende 0:ca855d29545b 60 //pc1.printf("IP: %s\r\n",this->ip);
jwende 0:ca855d29545b 61 //pc1.printf("Port: %i\r\n",this->port);
jwende 0:ca855d29545b 62 //pc1.printf("Result: %i \r\n", result);
jwende 0:ca855d29545b 63
jwende 0:ca855d29545b 64 if (result==0) {
jwende 0:ca855d29545b 65 nextMsgId = 1;
jwende 0:ca855d29545b 66 char d[9] = {0x00,0x06,'M','Q','I','s','d','p',MQTTPROTOCOLVERSION};
jwende 0:ca855d29545b 67 // Leave room in the buffer for header and variable length field
jwende 0:ca855d29545b 68 int length = 5;
jwende 0:ca855d29545b 69 unsigned int j;
jwende 0:ca855d29545b 70 for (j = 0; j<9; j++) {
jwende 0:ca855d29545b 71 buffer[length++] = d[j];
jwende 0:ca855d29545b 72 }
jwende 0:ca855d29545b 73
jwende 0:ca855d29545b 74 char v;
jwende 0:ca855d29545b 75 if (willTopic) {
jwende 0:ca855d29545b 76 v = 0x06|(willQos<<3)|(willRetain<<5);
jwende 0:ca855d29545b 77 } else {
jwende 0:ca855d29545b 78 v = 0x02;
jwende 0:ca855d29545b 79 }
jwende 0:ca855d29545b 80
jwende 0:ca855d29545b 81 if(user != NULL) {
jwende 0:ca855d29545b 82 v = v|0x80;
jwende 0:ca855d29545b 83
jwende 0:ca855d29545b 84 if(pass != NULL) {
jwende 0:ca855d29545b 85 v = v|(0x80>>1);
jwende 0:ca855d29545b 86 }
jwende 0:ca855d29545b 87 }
jwende 0:ca855d29545b 88
jwende 0:ca855d29545b 89 buffer[length++] = v;
jwende 0:ca855d29545b 90
jwende 0:ca855d29545b 91 buffer[length++] = ((MQTT_KEEPALIVE) >> 8);
jwende 0:ca855d29545b 92 buffer[length++] = ((MQTT_KEEPALIVE) & 0xFF);
jwende 0:ca855d29545b 93 length = writeString(id,buffer,length);
jwende 0:ca855d29545b 94 if (willTopic) {
jwende 0:ca855d29545b 95 length = writeString(willTopic,buffer,length);
jwende 0:ca855d29545b 96 length = writeString(willMessage,buffer,length);
jwende 0:ca855d29545b 97 }
jwende 0:ca855d29545b 98
jwende 0:ca855d29545b 99 if(user != NULL) {
jwende 0:ca855d29545b 100 length = writeString(user,buffer,length);
jwende 0:ca855d29545b 101 if(pass != NULL) {
jwende 0:ca855d29545b 102 length = writeString(pass,buffer,length);
jwende 0:ca855d29545b 103 }
jwende 0:ca855d29545b 104 }
jwende 0:ca855d29545b 105 //pc1.printf("Before MQTT Connect ... \r\n");
jwende 0:ca855d29545b 106 write(MQTTCONNECT,buffer,length-5);
jwende 0:ca855d29545b 107
jwende 0:ca855d29545b 108 lastInActivity = lastOutActivity = millis();
jwende 0:ca855d29545b 109
jwende 0:ca855d29545b 110 int llen=128;
jwende 0:ca855d29545b 111 int len =0;
nileshvora 1:c233cee7c15b 112
jwende 0:ca855d29545b 113 while ((len=readPacket(llen))==0) {
jwende 0:ca855d29545b 114 unsigned long t = millis();
jwende 0:ca855d29545b 115 if (t-lastInActivity > MQTT_KEEPALIVE*1000UL) {
nileshvora 1:c233cee7c15b 116 _state = MQTT_CONNECTION_TIMEOUT;
jwende 0:ca855d29545b 117 _client.close(true);
jwende 0:ca855d29545b 118 return false;
jwende 0:ca855d29545b 119 }
jwende 0:ca855d29545b 120 }
jwende 0:ca855d29545b 121 //pc1.printf("after MQTT Connect ... %i\r\n",len);
nileshvora 1:c233cee7c15b 122 if (len == 4) {
nileshvora 1:c233cee7c15b 123 if (buffer[3] == 0) {
nileshvora 1:c233cee7c15b 124 lastInActivity = millis();
nileshvora 1:c233cee7c15b 125 pingOutstanding = false;
nileshvora 1:c233cee7c15b 126 _state = MQTT_CONNECTED;
nileshvora 1:c233cee7c15b 127 return true;
nileshvora 1:c233cee7c15b 128 } else {
nileshvora 1:c233cee7c15b 129 _state = buffer[3];
nileshvora 1:c233cee7c15b 130 }
jwende 0:ca855d29545b 131 }
jwende 0:ca855d29545b 132 }
jwende 0:ca855d29545b 133 _client.close(true);
jwende 0:ca855d29545b 134 }
jwende 0:ca855d29545b 135 return false;
jwende 0:ca855d29545b 136 }
jwende 0:ca855d29545b 137
jwende 0:ca855d29545b 138
jwende 0:ca855d29545b 139 int PubSubClient::readPacket(int lengthLength)
jwende 0:ca855d29545b 140 {
jwende 0:ca855d29545b 141 int len = 0;
jwende 0:ca855d29545b 142 len = _client.receive_all(buffer,lengthLength);
jwende 0:ca855d29545b 143 return len;
jwende 0:ca855d29545b 144 }
jwende 0:ca855d29545b 145
jwende 0:ca855d29545b 146 bool PubSubClient::loop()
jwende 0:ca855d29545b 147 {
jwende 0:ca855d29545b 148 if (connected()) {
jwende 0:ca855d29545b 149 unsigned long t = millis();
jwende 0:ca855d29545b 150 if ((t - lastInActivity > MQTT_KEEPALIVE*1000UL) || (t - lastOutActivity > MQTT_KEEPALIVE*1000UL)) {
jwende 0:ca855d29545b 151 if (pingOutstanding) {
nileshvora 1:c233cee7c15b 152 this->_state = MQTT_CONNECTION_TIMEOUT;
jwende 0:ca855d29545b 153 _client.close(true);
jwende 0:ca855d29545b 154 return false;
jwende 0:ca855d29545b 155 } else {
jwende 0:ca855d29545b 156 buffer[0] = MQTTPINGREQ;
jwende 0:ca855d29545b 157 buffer[1] = 0;
jwende 0:ca855d29545b 158 _client.send(buffer,2);
jwende 0:ca855d29545b 159 lastOutActivity = t;
jwende 0:ca855d29545b 160 lastInActivity = t;
jwende 0:ca855d29545b 161 pingOutstanding = true;
jwende 0:ca855d29545b 162 }
jwende 0:ca855d29545b 163 }
jwende 0:ca855d29545b 164 int len;
jwende 0:ca855d29545b 165 int llen= 128;
jwende 0:ca855d29545b 166 if (!((len=readPacket(llen))==0)) {
jwende 0:ca855d29545b 167 if (len > 0) {
jwende 0:ca855d29545b 168 lastInActivity = t;
jwende 0:ca855d29545b 169 char type = buffer[0]&0xF0;
nileshvora 1:c233cee7c15b 170 //pc1.printf("type :: %d\r\n",type);
nileshvora 1:c233cee7c15b 171 //pc1.printf("buffer[%d] :: %d\r\n",len-1,buffer[len-1]);
jwende 0:ca855d29545b 172 if (type == MQTTPUBLISH) {
jwende 0:ca855d29545b 173 if (callback) {
jwende 0:ca855d29545b 174 //pc1.printf("MQTTPUBLISH received ... %i\r\n",len);
jwende 0:ca855d29545b 175 int tl = (buffer[2]<<8)+buffer[3];
jwende 0:ca855d29545b 176 //pc1.printf("t1 ... %i\r\n",tl);
jwende 0:ca855d29545b 177 char topic[tl+1];
jwende 0:ca855d29545b 178 for (int i=0; i<tl; i++) {
jwende 0:ca855d29545b 179 topic[i] = buffer[4+i];
jwende 0:ca855d29545b 180 }
jwende 0:ca855d29545b 181 topic[tl] = 0;
jwende 0:ca855d29545b 182 //pc1.printf("MQTTPUBLISH Topic ... %s\r\n",topic);
jwende 0:ca855d29545b 183 // ignore msgID - only support QoS 0 subs
jwende 0:ca855d29545b 184 int t2 = len-4-tl;
jwende 0:ca855d29545b 185 //pc1.printf("t2 ... %i\r\n",t2);
jwende 0:ca855d29545b 186 char payload[t2+1];
jwende 0:ca855d29545b 187 for (int i=0; i<t2; i++) {
jwende 0:ca855d29545b 188 payload[i] = buffer[4+i+tl];
jwende 0:ca855d29545b 189 }
jwende 0:ca855d29545b 190 payload[t2] = 0;
jwende 0:ca855d29545b 191 //pc1.printf("MQTTPUBLISH Payload ... %s\r\n",payload);
jwende 0:ca855d29545b 192 callback(topic,payload,t2);
jwende 0:ca855d29545b 193 }
jwende 0:ca855d29545b 194 } else if (type == MQTTPINGREQ) {
jwende 0:ca855d29545b 195 buffer[0] = MQTTPINGRESP;
jwende 0:ca855d29545b 196 buffer[1] = 0;
jwende 0:ca855d29545b 197 _client.send(buffer,2);
jwende 0:ca855d29545b 198 } else if (type == MQTTPINGRESP) {
jwende 0:ca855d29545b 199 pingOutstanding = false;
nileshvora 1:c233cee7c15b 200 } else {
nileshvora 1:c233cee7c15b 201 //for(int i=0;i<=len;i++)
nileshvora 1:c233cee7c15b 202 //pc1.printf("buffer[%d] :: %d\r\n",i,buffer[i]);
nileshvora 1:c233cee7c15b 203 if (buffer[0] == 144 && buffer[len-1] == 0) {
nileshvora 1:c233cee7c15b 204 pc1.printf("Subscribed\r\n");
nileshvora 1:c233cee7c15b 205 }
nileshvora 1:c233cee7c15b 206 if (true) {
nileshvora 1:c233cee7c15b 207 //pc1.printf("In loop function buffer :: %d\r\n",buffer[len-1]);
nileshvora 1:c233cee7c15b 208 pubsub_error_code = buffer[len-1];
nileshvora 1:c233cee7c15b 209 }
jwende 0:ca855d29545b 210 }
jwende 0:ca855d29545b 211 }
jwende 0:ca855d29545b 212 }
jwende 0:ca855d29545b 213 return true;
jwende 0:ca855d29545b 214 }
jwende 0:ca855d29545b 215 return false;
jwende 0:ca855d29545b 216 }
jwende 0:ca855d29545b 217
jwende 0:ca855d29545b 218 bool PubSubClient::publish(char* topic, char* payload)
jwende 0:ca855d29545b 219 {
jwende 0:ca855d29545b 220 return publish(topic,payload,strlen(payload),false);
jwende 0:ca855d29545b 221 }
jwende 0:ca855d29545b 222
jwende 0:ca855d29545b 223 bool PubSubClient::publish(char* topic, char* payload, unsigned int plength)
jwende 0:ca855d29545b 224 {
jwende 0:ca855d29545b 225 return publish(topic, payload, plength, false);
jwende 0:ca855d29545b 226 }
jwende 0:ca855d29545b 227
jwende 0:ca855d29545b 228 bool PubSubClient::publish(char* topic, char* payload, unsigned int plength, bool retained)
jwende 0:ca855d29545b 229 {
jwende 0:ca855d29545b 230 if (connected()) {
jwende 0:ca855d29545b 231 // Leave room in the buffer for header and variable length field
nileshvora 1:c233cee7c15b 232 //pc1.printf("in publish ... $$$$$$$$$$$:::%s\r\n",topic);
jwende 0:ca855d29545b 233 //pc1.printf("in publish ... %s\r\n",payload);
jwende 0:ca855d29545b 234 int length = 5;
jwende 0:ca855d29545b 235 length = writeString(topic,buffer,length);
jwende 0:ca855d29545b 236 int i;
jwende 0:ca855d29545b 237 for (i=0; i<plength; i++) {
jwende 0:ca855d29545b 238 buffer[length++] = payload[i];
jwende 0:ca855d29545b 239 }
jwende 0:ca855d29545b 240 short header = MQTTPUBLISH;
jwende 0:ca855d29545b 241 if (retained) {
jwende 0:ca855d29545b 242 header |= 1;
jwende 0:ca855d29545b 243 }
jwende 0:ca855d29545b 244 return write(header,buffer,length-5);
jwende 0:ca855d29545b 245 }
jwende 0:ca855d29545b 246 return false;
jwende 0:ca855d29545b 247 }
jwende 0:ca855d29545b 248
jwende 0:ca855d29545b 249
jwende 0:ca855d29545b 250
jwende 0:ca855d29545b 251 bool PubSubClient::write(short header, char* buf, int length)
jwende 0:ca855d29545b 252 {
jwende 0:ca855d29545b 253 short lenBuf[4];
jwende 0:ca855d29545b 254 short llen = 0;
jwende 0:ca855d29545b 255 short digit;
jwende 0:ca855d29545b 256 short pos = 0;
jwende 0:ca855d29545b 257 short rc;
jwende 0:ca855d29545b 258 short len = length;
jwende 0:ca855d29545b 259 //pc1.printf("in write ... %d\r\n",length);
nileshvora 1:c233cee7c15b 260 //pc1.printf("in write ...$$$$$$:: %s\r\n",buf);
jwende 0:ca855d29545b 261 do {
jwende 0:ca855d29545b 262 digit = len % 128;
jwende 0:ca855d29545b 263 len = len / 128;
jwende 0:ca855d29545b 264 if (len > 0) {
jwende 0:ca855d29545b 265 digit |= 0x80;
jwende 0:ca855d29545b 266 }
jwende 0:ca855d29545b 267 lenBuf[pos++] = digit;
jwende 0:ca855d29545b 268 llen++;
jwende 0:ca855d29545b 269 } while(len>0);
jwende 0:ca855d29545b 270
jwende 0:ca855d29545b 271 buf[4-llen] = header;
jwende 0:ca855d29545b 272 for (int i=0; i<llen; i++) {
jwende 0:ca855d29545b 273 buf[5-llen+i] = lenBuf[i];
jwende 0:ca855d29545b 274 }
jwende 0:ca855d29545b 275 rc = _client.send(buf+(4-llen),length+1+llen);
jwende 0:ca855d29545b 276
jwende 0:ca855d29545b 277 lastOutActivity = millis();
jwende 0:ca855d29545b 278 return (rc == 1+llen+length);
jwende 0:ca855d29545b 279 }
jwende 0:ca855d29545b 280
jwende 0:ca855d29545b 281 bool PubSubClient::subscribe(char* topic)
jwende 0:ca855d29545b 282 {
jwende 0:ca855d29545b 283 //pc1.printf("in subscribe ... %s\r\n",topic);
jwende 0:ca855d29545b 284 if (connected()) {
jwende 0:ca855d29545b 285 // Leave room in the buffer for header and variable length field
jwende 0:ca855d29545b 286 int length = 5;
jwende 0:ca855d29545b 287 nextMsgId++;
jwende 0:ca855d29545b 288 if (nextMsgId == 0) {
jwende 0:ca855d29545b 289 nextMsgId = 1;
jwende 0:ca855d29545b 290 }
jwende 0:ca855d29545b 291 buffer[length++] = (nextMsgId >> 8);
jwende 0:ca855d29545b 292 buffer[length++] = (nextMsgId & 0xFF);
jwende 0:ca855d29545b 293 length = writeString(topic, buffer,length);
jwende 0:ca855d29545b 294 buffer[length++] = 0; // Only do QoS 0 subs
jwende 0:ca855d29545b 295 return write(MQTTSUBSCRIBE|MQTTQOS1,buffer,length-5);
jwende 0:ca855d29545b 296 }
jwende 0:ca855d29545b 297 return false;
jwende 0:ca855d29545b 298 }
jwende 0:ca855d29545b 299
jwende 0:ca855d29545b 300 bool PubSubClient::unsubscribe(char* topic)
jwende 0:ca855d29545b 301 {
jwende 0:ca855d29545b 302 if (connected()) {
jwende 0:ca855d29545b 303 int length = 5;
jwende 0:ca855d29545b 304 nextMsgId++;
jwende 0:ca855d29545b 305 if (nextMsgId == 0) {
jwende 0:ca855d29545b 306 nextMsgId = 1;
jwende 0:ca855d29545b 307 }
jwende 0:ca855d29545b 308 buffer[length++] = (nextMsgId >> 8);
jwende 0:ca855d29545b 309 buffer[length++] = (nextMsgId & 0xFF);
jwende 0:ca855d29545b 310 length = writeString(topic, buffer,length);
jwende 0:ca855d29545b 311 return write(MQTTUNSUBSCRIBE|MQTTQOS1,buffer,length-5);
jwende 0:ca855d29545b 312 }
jwende 0:ca855d29545b 313 return false;
jwende 0:ca855d29545b 314 }
jwende 0:ca855d29545b 315
jwende 0:ca855d29545b 316 void PubSubClient::disconnect()
jwende 0:ca855d29545b 317 {
jwende 0:ca855d29545b 318 buffer[0] = MQTTDISCONNECT;
jwende 0:ca855d29545b 319 buffer[1] = 0;
jwende 0:ca855d29545b 320 _client.send(buffer,2);
nileshvora 1:c233cee7c15b 321 _state = MQTT_DISCONNECTED;
jwende 0:ca855d29545b 322 _client.close(true);
jwende 0:ca855d29545b 323 lastInActivity = lastOutActivity = millis();
jwende 0:ca855d29545b 324 }
jwende 0:ca855d29545b 325
jwende 0:ca855d29545b 326 int PubSubClient::writeString(char* string, char* buf, int pos)
jwende 0:ca855d29545b 327 {
jwende 0:ca855d29545b 328 char* idp = string;
jwende 0:ca855d29545b 329 int i = 0;
jwende 0:ca855d29545b 330 pos += 2;
jwende 0:ca855d29545b 331 while (*idp) {
jwende 0:ca855d29545b 332 buf[pos++] = *idp++;
jwende 0:ca855d29545b 333 i++;
jwende 0:ca855d29545b 334 }
jwende 0:ca855d29545b 335 buf[pos-i-2] = (i >> 8);
jwende 0:ca855d29545b 336 buf[pos-i-1] = (i & 0xFF);
jwende 0:ca855d29545b 337 return pos;
jwende 0:ca855d29545b 338 }
jwende 0:ca855d29545b 339
jwende 0:ca855d29545b 340
jwende 0:ca855d29545b 341 bool PubSubClient::connected()
jwende 0:ca855d29545b 342 {
jwende 0:ca855d29545b 343 bool rc;
jwende 0:ca855d29545b 344 rc = (int)_client.is_connected();
jwende 0:ca855d29545b 345 if (!rc) _client.close(true);
jwende 0:ca855d29545b 346 return rc;
nileshvora 1:c233cee7c15b 347 }
nileshvora 1:c233cee7c15b 348
nileshvora 1:c233cee7c15b 349 PubSubClient& PubSubClient::setCallback(MQTT_CALLBACK_SIGNATURE)
nileshvora 1:c233cee7c15b 350 {
nileshvora 1:c233cee7c15b 351 this->callback = callback;
nileshvora 1:c233cee7c15b 352 return *this;
nileshvora 1:c233cee7c15b 353 }
nileshvora 1:c233cee7c15b 354
nileshvora 1:c233cee7c15b 355 int PubSubClient::mqtt_state()
nileshvora 1:c233cee7c15b 356 {
nileshvora 1:c233cee7c15b 357 return this->_state;
jwende 0:ca855d29545b 358 }