MQTT client for mbed Port of the Arduino MQTT Client: http://knolleary.net/arduino-client-for-mqtt/
PubSubClient.cpp@1:05fe2e37b93d, 2016-02-04 (annotated)
- Committer:
- dwijaybane
- Date:
- Thu Feb 04 06:46:15 2016 +0000
- Revision:
- 1:05fe2e37b93d
- Parent:
- 0:c492c0206878
keep alive timeout increased
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
dwijaybane | 0:c492c0206878 | 1 | /* |
dwijaybane | 0:c492c0206878 | 2 | PubSubClient.cpp - A simple client for MQTT. |
dwijaybane | 0:c492c0206878 | 3 | Nicholas O'Leary |
dwijaybane | 0:c492c0206878 | 4 | http://knolleary.net |
dwijaybane | 0:c492c0206878 | 5 | |
dwijaybane | 0:c492c0206878 | 6 | improved port for mbed |
dwijaybane | 0:c492c0206878 | 7 | Edutech IoT Team |
dwijaybane | 0:c492c0206878 | 8 | */ |
dwijaybane | 0:c492c0206878 | 9 | |
dwijaybane | 0:c492c0206878 | 10 | #include "PubSubClient.h" |
dwijaybane | 0:c492c0206878 | 11 | |
dwijaybane | 0:c492c0206878 | 12 | //Serial pc1(USBTX, USBRX); |
dwijaybane | 0:c492c0206878 | 13 | |
dwijaybane | 0:c492c0206878 | 14 | |
dwijaybane | 0:c492c0206878 | 15 | int PubSubClient::millis() |
dwijaybane | 0:c492c0206878 | 16 | { |
dwijaybane | 0:c492c0206878 | 17 | return t.read_ms(); |
dwijaybane | 0:c492c0206878 | 18 | } |
dwijaybane | 0:c492c0206878 | 19 | |
dwijaybane | 0:c492c0206878 | 20 | PubSubClient::PubSubClient() |
dwijaybane | 0:c492c0206878 | 21 | { |
dwijaybane | 0:c492c0206878 | 22 | } |
dwijaybane | 0:c492c0206878 | 23 | |
dwijaybane | 0:c492c0206878 | 24 | PubSubClient::PubSubClient(char *ip, int port, void (*callback)(char*,char*,unsigned int)) |
dwijaybane | 0:c492c0206878 | 25 | { |
dwijaybane | 0:c492c0206878 | 26 | this->callback = callback; |
dwijaybane | 0:c492c0206878 | 27 | this->ip = ip; |
dwijaybane | 0:c492c0206878 | 28 | this->port = port; |
dwijaybane | 0:c492c0206878 | 29 | t.start(); |
dwijaybane | 0:c492c0206878 | 30 | } |
dwijaybane | 0:c492c0206878 | 31 | |
dwijaybane | 0:c492c0206878 | 32 | |
dwijaybane | 0:c492c0206878 | 33 | bool PubSubClient::connect(char *id) |
dwijaybane | 0:c492c0206878 | 34 | { |
dwijaybane | 0:c492c0206878 | 35 | return connect(id,NULL,NULL,0,0,0,0); |
dwijaybane | 0:c492c0206878 | 36 | } |
dwijaybane | 0:c492c0206878 | 37 | |
dwijaybane | 0:c492c0206878 | 38 | bool PubSubClient::connect(char *id, char *user, char *pass) |
dwijaybane | 0:c492c0206878 | 39 | { |
dwijaybane | 0:c492c0206878 | 40 | return connect(id,user,pass,0,0,0,0); |
dwijaybane | 0:c492c0206878 | 41 | } |
dwijaybane | 0:c492c0206878 | 42 | |
dwijaybane | 0:c492c0206878 | 43 | bool PubSubClient::connect(char *id, char* willTopic, short willQos, short willRetain, char* willMessage) |
dwijaybane | 0:c492c0206878 | 44 | { |
dwijaybane | 0:c492c0206878 | 45 | return connect(id,NULL,NULL,willTopic,willQos,willRetain,willMessage); |
dwijaybane | 0:c492c0206878 | 46 | } |
dwijaybane | 0:c492c0206878 | 47 | |
dwijaybane | 0:c492c0206878 | 48 | bool PubSubClient::connect(char *id, char *user, char *pass, char* willTopic, short willQos, short willRetain, char* willMessage) |
dwijaybane | 0:c492c0206878 | 49 | { |
dwijaybane | 0:c492c0206878 | 50 | if (!connected()) { |
dwijaybane | 0:c492c0206878 | 51 | int result = 0; |
dwijaybane | 0:c492c0206878 | 52 | result = _client.connect(this->ip, this->port); |
dwijaybane | 0:c492c0206878 | 53 | _client.set_blocking(false, 1); |
dwijaybane | 0:c492c0206878 | 54 | //pc1.printf("IP: %s\r\n",this->ip); |
dwijaybane | 0:c492c0206878 | 55 | //pc1.printf("Port: %i\r\n",this->port); |
dwijaybane | 0:c492c0206878 | 56 | //pc1.printf("Result: %i \r\n", result); |
dwijaybane | 0:c492c0206878 | 57 | |
dwijaybane | 0:c492c0206878 | 58 | if (result==0) { |
dwijaybane | 0:c492c0206878 | 59 | nextMsgId = 1; |
dwijaybane | 0:c492c0206878 | 60 | char d[9] = {0x00,0x06,'M','Q','I','s','d','p',MQTTPROTOCOLVERSION}; |
dwijaybane | 0:c492c0206878 | 61 | // Leave room in the buffer for header and variable length field |
dwijaybane | 0:c492c0206878 | 62 | int length = 5; |
dwijaybane | 0:c492c0206878 | 63 | unsigned int j; |
dwijaybane | 0:c492c0206878 | 64 | for (j = 0; j<9; j++) { |
dwijaybane | 0:c492c0206878 | 65 | buffer[length++] = d[j]; |
dwijaybane | 0:c492c0206878 | 66 | } |
dwijaybane | 0:c492c0206878 | 67 | |
dwijaybane | 0:c492c0206878 | 68 | char v; |
dwijaybane | 0:c492c0206878 | 69 | if (willTopic) { |
dwijaybane | 0:c492c0206878 | 70 | v = 0x06|(willQos<<3)|(willRetain<<5); |
dwijaybane | 0:c492c0206878 | 71 | } else { |
dwijaybane | 0:c492c0206878 | 72 | v = 0x02; |
dwijaybane | 0:c492c0206878 | 73 | } |
dwijaybane | 0:c492c0206878 | 74 | |
dwijaybane | 0:c492c0206878 | 75 | if(user != NULL) { |
dwijaybane | 0:c492c0206878 | 76 | v = v|0x80; |
dwijaybane | 0:c492c0206878 | 77 | |
dwijaybane | 0:c492c0206878 | 78 | if(pass != NULL) { |
dwijaybane | 0:c492c0206878 | 79 | v = v|(0x80>>1); |
dwijaybane | 0:c492c0206878 | 80 | } |
dwijaybane | 0:c492c0206878 | 81 | } |
dwijaybane | 0:c492c0206878 | 82 | |
dwijaybane | 0:c492c0206878 | 83 | buffer[length++] = v; |
dwijaybane | 0:c492c0206878 | 84 | |
dwijaybane | 0:c492c0206878 | 85 | buffer[length++] = ((MQTT_KEEPALIVE) >> 8); |
dwijaybane | 0:c492c0206878 | 86 | buffer[length++] = ((MQTT_KEEPALIVE) & 0xFF); |
dwijaybane | 0:c492c0206878 | 87 | length = writeString(id,buffer,length); |
dwijaybane | 0:c492c0206878 | 88 | if (willTopic) { |
dwijaybane | 0:c492c0206878 | 89 | length = writeString(willTopic,buffer,length); |
dwijaybane | 0:c492c0206878 | 90 | length = writeString(willMessage,buffer,length); |
dwijaybane | 0:c492c0206878 | 91 | } |
dwijaybane | 0:c492c0206878 | 92 | |
dwijaybane | 0:c492c0206878 | 93 | if(user != NULL) { |
dwijaybane | 0:c492c0206878 | 94 | length = writeString(user,buffer,length); |
dwijaybane | 0:c492c0206878 | 95 | if(pass != NULL) { |
dwijaybane | 0:c492c0206878 | 96 | length = writeString(pass,buffer,length); |
dwijaybane | 0:c492c0206878 | 97 | } |
dwijaybane | 0:c492c0206878 | 98 | } |
dwijaybane | 0:c492c0206878 | 99 | //pc1.printf("Before MQTT Connect ... \r\n"); |
dwijaybane | 0:c492c0206878 | 100 | write(MQTTCONNECT,buffer,length-5); |
dwijaybane | 0:c492c0206878 | 101 | |
dwijaybane | 0:c492c0206878 | 102 | lastInActivity = lastOutActivity = millis(); |
dwijaybane | 0:c492c0206878 | 103 | |
dwijaybane | 0:c492c0206878 | 104 | int llen=128; |
dwijaybane | 0:c492c0206878 | 105 | int len =0; |
dwijaybane | 0:c492c0206878 | 106 | |
dwijaybane | 0:c492c0206878 | 107 | while ((len=readPacket(llen))==0) { |
dwijaybane | 0:c492c0206878 | 108 | unsigned long t = millis(); |
dwijaybane | 0:c492c0206878 | 109 | if (t-lastInActivity > MQTT_KEEPALIVE*1000UL) { |
dwijaybane | 0:c492c0206878 | 110 | _client.close(true); |
dwijaybane | 0:c492c0206878 | 111 | return false; |
dwijaybane | 0:c492c0206878 | 112 | } |
dwijaybane | 0:c492c0206878 | 113 | } |
dwijaybane | 0:c492c0206878 | 114 | //pc1.printf("after MQTT Connect ... %i\r\n",len); |
dwijaybane | 0:c492c0206878 | 115 | if (len == 4 && buffer[3] == 0) { |
dwijaybane | 0:c492c0206878 | 116 | lastInActivity = millis(); |
dwijaybane | 0:c492c0206878 | 117 | pingOutstanding = false; |
dwijaybane | 0:c492c0206878 | 118 | return true; |
dwijaybane | 0:c492c0206878 | 119 | } |
dwijaybane | 0:c492c0206878 | 120 | } |
dwijaybane | 0:c492c0206878 | 121 | _client.close(true); |
dwijaybane | 0:c492c0206878 | 122 | } |
dwijaybane | 0:c492c0206878 | 123 | return false; |
dwijaybane | 0:c492c0206878 | 124 | } |
dwijaybane | 0:c492c0206878 | 125 | |
dwijaybane | 0:c492c0206878 | 126 | |
dwijaybane | 0:c492c0206878 | 127 | int PubSubClient::readPacket(int lengthLength) |
dwijaybane | 0:c492c0206878 | 128 | { |
dwijaybane | 0:c492c0206878 | 129 | int len = 0; |
dwijaybane | 0:c492c0206878 | 130 | len = _client.receive_all(buffer,lengthLength); |
dwijaybane | 0:c492c0206878 | 131 | return len; |
dwijaybane | 0:c492c0206878 | 132 | } |
dwijaybane | 0:c492c0206878 | 133 | |
dwijaybane | 0:c492c0206878 | 134 | bool PubSubClient::loop() |
dwijaybane | 0:c492c0206878 | 135 | { |
dwijaybane | 0:c492c0206878 | 136 | if (connected()) { |
dwijaybane | 0:c492c0206878 | 137 | unsigned long t = millis(); |
dwijaybane | 0:c492c0206878 | 138 | if ((t - lastInActivity > MQTT_KEEPALIVE*1000UL) || (t - lastOutActivity > MQTT_KEEPALIVE*1000UL)) { |
dwijaybane | 0:c492c0206878 | 139 | if (pingOutstanding) { |
dwijaybane | 0:c492c0206878 | 140 | _client.close(true); |
dwijaybane | 0:c492c0206878 | 141 | return false; |
dwijaybane | 0:c492c0206878 | 142 | } else { |
dwijaybane | 0:c492c0206878 | 143 | buffer[0] = MQTTPINGREQ; |
dwijaybane | 0:c492c0206878 | 144 | buffer[1] = 0; |
dwijaybane | 0:c492c0206878 | 145 | _client.send(buffer,2); |
dwijaybane | 0:c492c0206878 | 146 | lastOutActivity = t; |
dwijaybane | 0:c492c0206878 | 147 | lastInActivity = t; |
dwijaybane | 0:c492c0206878 | 148 | pingOutstanding = true; |
dwijaybane | 0:c492c0206878 | 149 | } |
dwijaybane | 0:c492c0206878 | 150 | } |
dwijaybane | 0:c492c0206878 | 151 | int len; |
dwijaybane | 0:c492c0206878 | 152 | int llen= 128; |
dwijaybane | 0:c492c0206878 | 153 | if (!((len=readPacket(llen))==0)) { |
dwijaybane | 0:c492c0206878 | 154 | if (len > 0) { |
dwijaybane | 0:c492c0206878 | 155 | lastInActivity = t; |
dwijaybane | 0:c492c0206878 | 156 | char type = buffer[0]&0xF0; |
dwijaybane | 0:c492c0206878 | 157 | if (type == MQTTPUBLISH) { |
dwijaybane | 0:c492c0206878 | 158 | if (callback) { |
dwijaybane | 0:c492c0206878 | 159 | //pc1.printf("MQTTPUBLISH received ... %i\r\n",len); |
dwijaybane | 0:c492c0206878 | 160 | int tl = (buffer[2]<<8)+buffer[3]; |
dwijaybane | 0:c492c0206878 | 161 | //pc1.printf("t1 ... %i\r\n",tl); |
dwijaybane | 0:c492c0206878 | 162 | char topic[tl+1]; |
dwijaybane | 0:c492c0206878 | 163 | for (int i=0; i<tl; i++) { |
dwijaybane | 0:c492c0206878 | 164 | topic[i] = buffer[4+i]; |
dwijaybane | 0:c492c0206878 | 165 | } |
dwijaybane | 0:c492c0206878 | 166 | topic[tl] = 0; |
dwijaybane | 0:c492c0206878 | 167 | //pc1.printf("MQTTPUBLISH Topic ... %s\r\n",topic); |
dwijaybane | 0:c492c0206878 | 168 | // ignore msgID - only support QoS 0 subs |
dwijaybane | 0:c492c0206878 | 169 | int t2 = len-4-tl; |
dwijaybane | 0:c492c0206878 | 170 | //pc1.printf("t2 ... %i\r\n",t2); |
dwijaybane | 0:c492c0206878 | 171 | char payload[t2+1]; |
dwijaybane | 0:c492c0206878 | 172 | for (int i=0; i<t2; i++) { |
dwijaybane | 0:c492c0206878 | 173 | payload[i] = buffer[4+i+tl]; |
dwijaybane | 0:c492c0206878 | 174 | } |
dwijaybane | 0:c492c0206878 | 175 | payload[t2] = 0; |
dwijaybane | 0:c492c0206878 | 176 | //pc1.printf("MQTTPUBLISH Payload ... %s\r\n",payload); |
dwijaybane | 0:c492c0206878 | 177 | callback(topic,payload,t2); |
dwijaybane | 0:c492c0206878 | 178 | } |
dwijaybane | 0:c492c0206878 | 179 | } else if (type == MQTTPINGREQ) { |
dwijaybane | 0:c492c0206878 | 180 | buffer[0] = MQTTPINGRESP; |
dwijaybane | 0:c492c0206878 | 181 | buffer[1] = 0; |
dwijaybane | 0:c492c0206878 | 182 | _client.send(buffer,2); |
dwijaybane | 0:c492c0206878 | 183 | } else if (type == MQTTPINGRESP) { |
dwijaybane | 0:c492c0206878 | 184 | pingOutstanding = false; |
dwijaybane | 0:c492c0206878 | 185 | } |
dwijaybane | 0:c492c0206878 | 186 | } |
dwijaybane | 0:c492c0206878 | 187 | } |
dwijaybane | 0:c492c0206878 | 188 | return true; |
dwijaybane | 0:c492c0206878 | 189 | } |
dwijaybane | 0:c492c0206878 | 190 | return false; |
dwijaybane | 0:c492c0206878 | 191 | } |
dwijaybane | 0:c492c0206878 | 192 | |
dwijaybane | 0:c492c0206878 | 193 | bool PubSubClient::publish(char* topic, char* payload) |
dwijaybane | 0:c492c0206878 | 194 | { |
dwijaybane | 0:c492c0206878 | 195 | return publish(topic,payload,strlen(payload),false); |
dwijaybane | 0:c492c0206878 | 196 | } |
dwijaybane | 0:c492c0206878 | 197 | |
dwijaybane | 0:c492c0206878 | 198 | bool PubSubClient::publish(char* topic, char* payload, unsigned int plength) |
dwijaybane | 0:c492c0206878 | 199 | { |
dwijaybane | 0:c492c0206878 | 200 | return publish(topic, payload, plength, false); |
dwijaybane | 0:c492c0206878 | 201 | } |
dwijaybane | 0:c492c0206878 | 202 | |
dwijaybane | 0:c492c0206878 | 203 | bool PubSubClient::publish(char* topic, char* payload, unsigned int plength, bool retained) |
dwijaybane | 0:c492c0206878 | 204 | { |
dwijaybane | 0:c492c0206878 | 205 | if (connected()) { |
dwijaybane | 0:c492c0206878 | 206 | // Leave room in the buffer for header and variable length field |
dwijaybane | 0:c492c0206878 | 207 | //pc1.printf("in publish ... %s\r\n",topic); |
dwijaybane | 0:c492c0206878 | 208 | //pc1.printf("in publish ... %s\r\n",payload); |
dwijaybane | 0:c492c0206878 | 209 | int length = 5; |
dwijaybane | 0:c492c0206878 | 210 | length = writeString(topic,buffer,length); |
dwijaybane | 0:c492c0206878 | 211 | int i; |
dwijaybane | 0:c492c0206878 | 212 | for (i=0; i<plength; i++) { |
dwijaybane | 0:c492c0206878 | 213 | buffer[length++] = payload[i]; |
dwijaybane | 0:c492c0206878 | 214 | } |
dwijaybane | 0:c492c0206878 | 215 | short header = MQTTPUBLISH; |
dwijaybane | 0:c492c0206878 | 216 | if (retained) { |
dwijaybane | 0:c492c0206878 | 217 | header |= 1; |
dwijaybane | 0:c492c0206878 | 218 | } |
dwijaybane | 0:c492c0206878 | 219 | return write(header,buffer,length-5); |
dwijaybane | 0:c492c0206878 | 220 | } |
dwijaybane | 0:c492c0206878 | 221 | return false; |
dwijaybane | 0:c492c0206878 | 222 | } |
dwijaybane | 0:c492c0206878 | 223 | |
dwijaybane | 0:c492c0206878 | 224 | |
dwijaybane | 0:c492c0206878 | 225 | |
dwijaybane | 0:c492c0206878 | 226 | bool PubSubClient::write(short header, char* buf, int length) |
dwijaybane | 0:c492c0206878 | 227 | { |
dwijaybane | 0:c492c0206878 | 228 | short lenBuf[4]; |
dwijaybane | 0:c492c0206878 | 229 | short llen = 0; |
dwijaybane | 0:c492c0206878 | 230 | short digit; |
dwijaybane | 0:c492c0206878 | 231 | short pos = 0; |
dwijaybane | 0:c492c0206878 | 232 | short rc; |
dwijaybane | 0:c492c0206878 | 233 | short len = length; |
dwijaybane | 0:c492c0206878 | 234 | //pc1.printf("in write ... %d\r\n",length); |
dwijaybane | 0:c492c0206878 | 235 | //pc1.printf("in write ... %s\r\n",buf); |
dwijaybane | 0:c492c0206878 | 236 | do { |
dwijaybane | 0:c492c0206878 | 237 | digit = len % 128; |
dwijaybane | 0:c492c0206878 | 238 | len = len / 128; |
dwijaybane | 0:c492c0206878 | 239 | if (len > 0) { |
dwijaybane | 0:c492c0206878 | 240 | digit |= 0x80; |
dwijaybane | 0:c492c0206878 | 241 | } |
dwijaybane | 0:c492c0206878 | 242 | lenBuf[pos++] = digit; |
dwijaybane | 0:c492c0206878 | 243 | llen++; |
dwijaybane | 0:c492c0206878 | 244 | } while(len>0); |
dwijaybane | 0:c492c0206878 | 245 | |
dwijaybane | 0:c492c0206878 | 246 | buf[4-llen] = header; |
dwijaybane | 0:c492c0206878 | 247 | for (int i=0; i<llen; i++) { |
dwijaybane | 0:c492c0206878 | 248 | buf[5-llen+i] = lenBuf[i]; |
dwijaybane | 0:c492c0206878 | 249 | } |
dwijaybane | 0:c492c0206878 | 250 | rc = _client.send(buf+(4-llen),length+1+llen); |
dwijaybane | 0:c492c0206878 | 251 | |
dwijaybane | 0:c492c0206878 | 252 | lastOutActivity = millis(); |
dwijaybane | 0:c492c0206878 | 253 | return (rc == 1+llen+length); |
dwijaybane | 0:c492c0206878 | 254 | } |
dwijaybane | 0:c492c0206878 | 255 | |
dwijaybane | 0:c492c0206878 | 256 | bool PubSubClient::subscribe(char* topic) |
dwijaybane | 0:c492c0206878 | 257 | { |
dwijaybane | 0:c492c0206878 | 258 | //pc1.printf("in subscribe ... %s\r\n",topic); |
dwijaybane | 0:c492c0206878 | 259 | if (connected()) { |
dwijaybane | 0:c492c0206878 | 260 | // Leave room in the buffer for header and variable length field |
dwijaybane | 0:c492c0206878 | 261 | int length = 5; |
dwijaybane | 0:c492c0206878 | 262 | nextMsgId++; |
dwijaybane | 0:c492c0206878 | 263 | if (nextMsgId == 0) { |
dwijaybane | 0:c492c0206878 | 264 | nextMsgId = 1; |
dwijaybane | 0:c492c0206878 | 265 | } |
dwijaybane | 0:c492c0206878 | 266 | buffer[length++] = (nextMsgId >> 8); |
dwijaybane | 0:c492c0206878 | 267 | buffer[length++] = (nextMsgId & 0xFF); |
dwijaybane | 0:c492c0206878 | 268 | length = writeString(topic, buffer,length); |
dwijaybane | 0:c492c0206878 | 269 | buffer[length++] = 0; // Only do QoS 0 subs |
dwijaybane | 0:c492c0206878 | 270 | return write(MQTTSUBSCRIBE|MQTTQOS1,buffer,length-5); |
dwijaybane | 0:c492c0206878 | 271 | } |
dwijaybane | 0:c492c0206878 | 272 | return false; |
dwijaybane | 0:c492c0206878 | 273 | } |
dwijaybane | 0:c492c0206878 | 274 | |
dwijaybane | 0:c492c0206878 | 275 | bool PubSubClient::unsubscribe(char* topic) |
dwijaybane | 0:c492c0206878 | 276 | { |
dwijaybane | 0:c492c0206878 | 277 | if (connected()) { |
dwijaybane | 0:c492c0206878 | 278 | int length = 5; |
dwijaybane | 0:c492c0206878 | 279 | nextMsgId++; |
dwijaybane | 0:c492c0206878 | 280 | if (nextMsgId == 0) { |
dwijaybane | 0:c492c0206878 | 281 | nextMsgId = 1; |
dwijaybane | 0:c492c0206878 | 282 | } |
dwijaybane | 0:c492c0206878 | 283 | buffer[length++] = (nextMsgId >> 8); |
dwijaybane | 0:c492c0206878 | 284 | buffer[length++] = (nextMsgId & 0xFF); |
dwijaybane | 0:c492c0206878 | 285 | length = writeString(topic, buffer,length); |
dwijaybane | 0:c492c0206878 | 286 | return write(MQTTUNSUBSCRIBE|MQTTQOS1,buffer,length-5); |
dwijaybane | 0:c492c0206878 | 287 | } |
dwijaybane | 0:c492c0206878 | 288 | return false; |
dwijaybane | 0:c492c0206878 | 289 | } |
dwijaybane | 0:c492c0206878 | 290 | |
dwijaybane | 0:c492c0206878 | 291 | void PubSubClient::disconnect() |
dwijaybane | 0:c492c0206878 | 292 | { |
dwijaybane | 0:c492c0206878 | 293 | buffer[0] = MQTTDISCONNECT; |
dwijaybane | 0:c492c0206878 | 294 | buffer[1] = 0; |
dwijaybane | 0:c492c0206878 | 295 | _client.send(buffer,2); |
dwijaybane | 0:c492c0206878 | 296 | _client.close(true); |
dwijaybane | 0:c492c0206878 | 297 | lastInActivity = lastOutActivity = millis(); |
dwijaybane | 0:c492c0206878 | 298 | } |
dwijaybane | 0:c492c0206878 | 299 | |
dwijaybane | 0:c492c0206878 | 300 | int PubSubClient::writeString(char* string, char* buf, int pos) |
dwijaybane | 0:c492c0206878 | 301 | { |
dwijaybane | 0:c492c0206878 | 302 | char* idp = string; |
dwijaybane | 0:c492c0206878 | 303 | int i = 0; |
dwijaybane | 0:c492c0206878 | 304 | pos += 2; |
dwijaybane | 0:c492c0206878 | 305 | while (*idp) { |
dwijaybane | 0:c492c0206878 | 306 | buf[pos++] = *idp++; |
dwijaybane | 0:c492c0206878 | 307 | i++; |
dwijaybane | 0:c492c0206878 | 308 | } |
dwijaybane | 0:c492c0206878 | 309 | buf[pos-i-2] = (i >> 8); |
dwijaybane | 0:c492c0206878 | 310 | buf[pos-i-1] = (i & 0xFF); |
dwijaybane | 0:c492c0206878 | 311 | return pos; |
dwijaybane | 0:c492c0206878 | 312 | } |
dwijaybane | 0:c492c0206878 | 313 | |
dwijaybane | 0:c492c0206878 | 314 | |
dwijaybane | 0:c492c0206878 | 315 | bool PubSubClient::connected() |
dwijaybane | 0:c492c0206878 | 316 | { |
dwijaybane | 0:c492c0206878 | 317 | bool rc; |
dwijaybane | 0:c492c0206878 | 318 | rc = (int)_client.is_connected(); |
dwijaybane | 0:c492c0206878 | 319 | if (!rc) _client.close(true); |
dwijaybane | 0:c492c0206878 | 320 | return rc; |
dwijaybane | 0:c492c0206878 | 321 | } |