589 lines
17 KiB
C++
589 lines
17 KiB
C++
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/*
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PubSubClient.cpp - A simple client for MQTT.
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Nick O'Leary
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http://knolleary.net
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*/
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#include "PubSubClient.h"
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#include "Arduino.h"
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PubSubClient::PubSubClient() {
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this->_state = MQTT_DISCONNECTED;
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this->_client = NULL;
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this->stream = NULL;
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setCallback(NULL);
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}
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PubSubClient::PubSubClient(Client& client) {
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this->_state = MQTT_DISCONNECTED;
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setClient(client);
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this->stream = NULL;
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}
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PubSubClient::PubSubClient(IPAddress addr, uint16_t port, Client& client) {
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this->_state = MQTT_DISCONNECTED;
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setServer(addr, port);
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setClient(client);
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this->stream = NULL;
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}
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PubSubClient::PubSubClient(IPAddress addr, uint16_t port, Client& client, Stream& stream) {
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this->_state = MQTT_DISCONNECTED;
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setServer(addr,port);
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setClient(client);
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setStream(stream);
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}
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PubSubClient::PubSubClient(IPAddress addr, uint16_t port, MQTT_CALLBACK_SIGNATURE, Client& client) {
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this->_state = MQTT_DISCONNECTED;
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setServer(addr, port);
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setCallback(callback);
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setClient(client);
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this->stream = NULL;
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}
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PubSubClient::PubSubClient(IPAddress addr, uint16_t port, MQTT_CALLBACK_SIGNATURE, Client& client, Stream& stream) {
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this->_state = MQTT_DISCONNECTED;
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setServer(addr,port);
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setCallback(callback);
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setClient(client);
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setStream(stream);
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}
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PubSubClient::PubSubClient(uint8_t *ip, uint16_t port, Client& client) {
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this->_state = MQTT_DISCONNECTED;
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setServer(ip, port);
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setClient(client);
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this->stream = NULL;
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}
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PubSubClient::PubSubClient(uint8_t *ip, uint16_t port, Client& client, Stream& stream) {
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this->_state = MQTT_DISCONNECTED;
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setServer(ip,port);
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setClient(client);
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setStream(stream);
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}
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PubSubClient::PubSubClient(uint8_t *ip, uint16_t port, MQTT_CALLBACK_SIGNATURE, Client& client) {
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this->_state = MQTT_DISCONNECTED;
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setServer(ip, port);
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setCallback(callback);
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setClient(client);
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this->stream = NULL;
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}
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PubSubClient::PubSubClient(uint8_t *ip, uint16_t port, MQTT_CALLBACK_SIGNATURE, Client& client, Stream& stream) {
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this->_state = MQTT_DISCONNECTED;
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setServer(ip,port);
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setCallback(callback);
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setClient(client);
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setStream(stream);
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}
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PubSubClient::PubSubClient(const char* domain, uint16_t port, Client& client) {
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this->_state = MQTT_DISCONNECTED;
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setServer(domain,port);
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setClient(client);
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this->stream = NULL;
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}
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PubSubClient::PubSubClient(const char* domain, uint16_t port, Client& client, Stream& stream) {
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this->_state = MQTT_DISCONNECTED;
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setServer(domain,port);
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setClient(client);
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setStream(stream);
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}
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PubSubClient::PubSubClient(const char* domain, uint16_t port, MQTT_CALLBACK_SIGNATURE, Client& client) {
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this->_state = MQTT_DISCONNECTED;
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setServer(domain,port);
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setCallback(callback);
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setClient(client);
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this->stream = NULL;
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}
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PubSubClient::PubSubClient(const char* domain, uint16_t port, MQTT_CALLBACK_SIGNATURE, Client& client, Stream& stream) {
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this->_state = MQTT_DISCONNECTED;
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setServer(domain,port);
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setCallback(callback);
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setClient(client);
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setStream(stream);
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}
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boolean PubSubClient::connect(const char *id) {
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return connect(id,NULL,NULL,0,0,0,0);
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}
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boolean PubSubClient::connect(const char *id, const char *user, const char *pass) {
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return connect(id,user,pass,0,0,0,0);
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}
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boolean PubSubClient::connect(const char *id, const char* willTopic, uint8_t willQos, boolean willRetain, const char* willMessage) {
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return connect(id,NULL,NULL,willTopic,willQos,willRetain,willMessage);
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}
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boolean PubSubClient::connect(const char *id, const char *user, const char *pass, const char* willTopic, uint8_t willQos, boolean willRetain, const char* willMessage) {
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if (!connected()) {
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int result = 0;
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if (domain != NULL) {
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result = _client->connect(this->domain, this->port);
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} else {
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result = _client->connect(this->ip, this->port);
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}
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if (result == 1) {
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nextMsgId = 1;
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// Leave room in the buffer for header and variable length field
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uint16_t length = 5;
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unsigned int j;
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#if MQTT_VERSION == MQTT_VERSION_3_1
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uint8_t d[9] = {0x00,0x06,'M','Q','I','s','d','p', MQTT_VERSION};
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#define MQTT_HEADER_VERSION_LENGTH 9
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#elif MQTT_VERSION == MQTT_VERSION_3_1_1
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uint8_t d[7] = {0x00,0x04,'M','Q','T','T',MQTT_VERSION};
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#define MQTT_HEADER_VERSION_LENGTH 7
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#endif
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for (j = 0;j<MQTT_HEADER_VERSION_LENGTH;j++) {
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buffer[length++] = d[j];
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}
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uint8_t v;
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if (willTopic) {
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v = 0x06|(willQos<<3)|(willRetain<<5);
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} else {
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v = 0x02;
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}
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if(user != NULL) {
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v = v|0x80;
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if(pass != NULL) {
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v = v|(0x80>>1);
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}
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}
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buffer[length++] = v;
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buffer[length++] = ((MQTT_KEEPALIVE) >> 8);
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buffer[length++] = ((MQTT_KEEPALIVE) & 0xFF);
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length = writeString(id,buffer,length);
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if (willTopic) {
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length = writeString(willTopic,buffer,length);
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length = writeString(willMessage,buffer,length);
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}
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if(user != NULL) {
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length = writeString(user,buffer,length);
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if(pass != NULL) {
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length = writeString(pass,buffer,length);
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}
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}
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write(MQTTCONNECT,buffer,length-5);
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lastInActivity = lastOutActivity = millis();
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while (!_client->available()) {
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unsigned long t = millis();
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if (t-lastInActivity >= ((int32_t) MQTT_SOCKET_TIMEOUT*1000UL)) {
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_state = MQTT_CONNECTION_TIMEOUT;
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_client->stop();
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return false;
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}
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}
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uint8_t llen;
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uint16_t len = readPacket(&llen);
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if (len == 4) {
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if (buffer[3] == 0) {
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lastInActivity = millis();
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pingOutstanding = false;
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_state = MQTT_CONNECTED;
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return true;
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} else {
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_state = buffer[3];
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}
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}
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_client->stop();
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} else {
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_state = MQTT_CONNECT_FAILED;
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}
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return false;
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}
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return true;
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}
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// reads a byte into result
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boolean PubSubClient::readByte(uint8_t * result) {
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uint32_t previousMillis = millis();
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while(!_client->available()) {
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uint32_t currentMillis = millis();
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if(currentMillis - previousMillis >= ((int32_t) MQTT_SOCKET_TIMEOUT * 1000)){
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return false;
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}
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}
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*result = _client->read();
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return true;
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}
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// reads a byte into result[*index] and increments index
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boolean PubSubClient::readByte(uint8_t * result, uint16_t * index){
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uint16_t current_index = *index;
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uint8_t * write_address = &(result[current_index]);
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if(readByte(write_address)){
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*index = current_index + 1;
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return true;
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}
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return false;
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}
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uint16_t PubSubClient::readPacket(uint8_t* lengthLength) {
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uint16_t len = 0;
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if(!readByte(buffer, &len)) return 0;
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bool isPublish = (buffer[0]&0xF0) == MQTTPUBLISH;
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uint32_t multiplier = 1;
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uint16_t length = 0;
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uint8_t digit = 0;
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uint16_t skip = 0;
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uint8_t start = 0;
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do {
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if(!readByte(&digit)) return 0;
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buffer[len++] = digit;
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length += (digit & 127) * multiplier;
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multiplier *= 128;
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} while ((digit & 128) != 0);
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*lengthLength = len-1;
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if (isPublish) {
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// Read in topic length to calculate bytes to skip over for Stream writing
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if(!readByte(buffer, &len)) return 0;
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if(!readByte(buffer, &len)) return 0;
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skip = (buffer[*lengthLength+1]<<8)+buffer[*lengthLength+2];
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start = 2;
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if (buffer[0]&MQTTQOS1) {
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// skip message id
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skip += 2;
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}
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}
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for (uint16_t i = start;i<length;i++) {
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if(!readByte(&digit)) return 0;
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if (this->stream) {
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if (isPublish && len-*lengthLength-2>skip) {
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this->stream->write(digit);
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}
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}
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if (len < MQTT_MAX_PACKET_SIZE) {
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buffer[len] = digit;
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}
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len++;
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}
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if (!this->stream && len > MQTT_MAX_PACKET_SIZE) {
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len = 0; // This will cause the packet to be ignored.
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}
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return len;
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}
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boolean PubSubClient::loop() {
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if (connected()) {
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unsigned long t = millis();
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if ((t - lastInActivity > MQTT_KEEPALIVE*1000UL) || (t - lastOutActivity > MQTT_KEEPALIVE*1000UL)) {
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if (pingOutstanding) {
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this->_state = MQTT_CONNECTION_TIMEOUT;
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_client->stop();
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return false;
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} else {
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buffer[0] = MQTTPINGREQ;
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buffer[1] = 0;
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_client->write(buffer,2);
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lastOutActivity = t;
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lastInActivity = t;
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pingOutstanding = true;
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}
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}
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if (_client->available()) {
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uint8_t llen;
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uint16_t len = readPacket(&llen);
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uint16_t msgId = 0;
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uint8_t *payload;
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if (len > 0) {
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lastInActivity = t;
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uint8_t type = buffer[0]&0xF0;
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if (type == MQTTPUBLISH) {
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if (callback) {
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uint16_t tl = (buffer[llen+1]<<8)+buffer[llen+2]; /* topic length in bytes */
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memmove(buffer+llen+2,buffer+llen+3,tl); /* move topic inside buffer 1 byte to front */
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buffer[llen+2+tl] = 0; /* end the topic as a 'C' string with \x00 */
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char *topic = (char*) buffer+llen+2;
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// msgId only present for QOS>0
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if ((buffer[0]&0x06) == MQTTQOS1) {
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msgId = (buffer[llen+3+tl]<<8)+buffer[llen+3+tl+1];
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payload = buffer+llen+3+tl+2;
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callback(topic,payload,len-llen-3-tl-2);
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buffer[0] = MQTTPUBACK;
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buffer[1] = 2;
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buffer[2] = (msgId >> 8);
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buffer[3] = (msgId & 0xFF);
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_client->write(buffer,4);
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lastOutActivity = t;
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} else {
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payload = buffer+llen+3+tl;
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callback(topic,payload,len-llen-3-tl);
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}
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}
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} else if (type == MQTTPINGREQ) {
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buffer[0] = MQTTPINGRESP;
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buffer[1] = 0;
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_client->write(buffer,2);
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} else if (type == MQTTPINGRESP) {
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pingOutstanding = false;
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}
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}
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}
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return true;
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}
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return false;
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}
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boolean PubSubClient::publish(const char* topic, const char* payload) {
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return publish(topic,(const uint8_t*)payload,strlen(payload),false);
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}
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boolean PubSubClient::publish(const char* topic, const char* payload, boolean retained) {
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return publish(topic,(const uint8_t*)payload,strlen(payload),retained);
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}
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boolean PubSubClient::publish(const char* topic, const uint8_t* payload, unsigned int plength) {
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return publish(topic, payload, plength, false);
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}
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boolean PubSubClient::publish(const char* topic, const uint8_t* payload, unsigned int plength, boolean retained) {
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if (connected()) {
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if (MQTT_MAX_PACKET_SIZE < 5 + 2+strlen(topic) + plength) {
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// Too long
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return false;
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}
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// Leave room in the buffer for header and variable length field
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uint16_t length = 5;
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length = writeString(topic,buffer,length);
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uint16_t i;
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for (i=0;i<plength;i++) {
|
||
|
|
buffer[length++] = payload[i];
|
||
|
|
}
|
||
|
|
uint8_t header = MQTTPUBLISH;
|
||
|
|
if (retained) {
|
||
|
|
header |= 1;
|
||
|
|
}
|
||
|
|
return write(header,buffer,length-5);
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
boolean PubSubClient::publish_P(const char* topic, const uint8_t* payload, unsigned int plength, boolean retained) {
|
||
|
|
uint8_t llen = 0;
|
||
|
|
uint8_t digit;
|
||
|
|
unsigned int rc = 0;
|
||
|
|
uint16_t tlen;
|
||
|
|
unsigned int pos = 0;
|
||
|
|
unsigned int i;
|
||
|
|
uint8_t header;
|
||
|
|
unsigned int len;
|
||
|
|
|
||
|
|
if (!connected()) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
tlen = strlen(topic);
|
||
|
|
|
||
|
|
header = MQTTPUBLISH;
|
||
|
|
if (retained) {
|
||
|
|
header |= 1;
|
||
|
|
}
|
||
|
|
buffer[pos++] = header;
|
||
|
|
len = plength + 2 + tlen;
|
||
|
|
do {
|
||
|
|
digit = len % 128;
|
||
|
|
len = len / 128;
|
||
|
|
if (len > 0) {
|
||
|
|
digit |= 0x80;
|
||
|
|
}
|
||
|
|
buffer[pos++] = digit;
|
||
|
|
llen++;
|
||
|
|
} while(len>0);
|
||
|
|
|
||
|
|
pos = writeString(topic,buffer,pos);
|
||
|
|
|
||
|
|
rc += _client->write(buffer,pos);
|
||
|
|
|
||
|
|
for (i=0;i<plength;i++) {
|
||
|
|
rc += _client->write((char)pgm_read_byte_near(payload + i));
|
||
|
|
}
|
||
|
|
|
||
|
|
lastOutActivity = millis();
|
||
|
|
|
||
|
|
return rc == tlen + 4 + plength;
|
||
|
|
}
|
||
|
|
|
||
|
|
boolean PubSubClient::write(uint8_t header, uint8_t* buf, uint16_t length) {
|
||
|
|
uint8_t lenBuf[4];
|
||
|
|
uint8_t llen = 0;
|
||
|
|
uint8_t digit;
|
||
|
|
uint8_t pos = 0;
|
||
|
|
uint16_t rc;
|
||
|
|
uint16_t len = length;
|
||
|
|
do {
|
||
|
|
digit = len % 128;
|
||
|
|
len = len / 128;
|
||
|
|
if (len > 0) {
|
||
|
|
digit |= 0x80;
|
||
|
|
}
|
||
|
|
lenBuf[pos++] = digit;
|
||
|
|
llen++;
|
||
|
|
} while(len>0);
|
||
|
|
|
||
|
|
buf[4-llen] = header;
|
||
|
|
for (int i=0;i<llen;i++) {
|
||
|
|
buf[5-llen+i] = lenBuf[i];
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef MQTT_MAX_TRANSFER_SIZE
|
||
|
|
uint8_t* writeBuf = buf+(4-llen);
|
||
|
|
uint16_t bytesRemaining = length+1+llen; //Match the length type
|
||
|
|
uint8_t bytesToWrite;
|
||
|
|
boolean result = true;
|
||
|
|
while((bytesRemaining > 0) && result) {
|
||
|
|
bytesToWrite = (bytesRemaining > MQTT_MAX_TRANSFER_SIZE)?MQTT_MAX_TRANSFER_SIZE:bytesRemaining;
|
||
|
|
rc = _client->write(writeBuf,bytesToWrite);
|
||
|
|
result = (rc == bytesToWrite);
|
||
|
|
bytesRemaining -= rc;
|
||
|
|
writeBuf += rc;
|
||
|
|
}
|
||
|
|
return result;
|
||
|
|
#else
|
||
|
|
rc = _client->write(buf+(4-llen),length+1+llen);
|
||
|
|
lastOutActivity = millis();
|
||
|
|
return (rc == 1+llen+length);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
boolean PubSubClient::subscribe(const char* topic) {
|
||
|
|
return subscribe(topic, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
boolean PubSubClient::subscribe(const char* topic, uint8_t qos) {
|
||
|
|
if (qos < 0 || qos > 1) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
if (MQTT_MAX_PACKET_SIZE < 9 + strlen(topic)) {
|
||
|
|
// Too long
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
if (connected()) {
|
||
|
|
// Leave room in the buffer for header and variable length field
|
||
|
|
uint16_t length = 5;
|
||
|
|
nextMsgId++;
|
||
|
|
if (nextMsgId == 0) {
|
||
|
|
nextMsgId = 1;
|
||
|
|
}
|
||
|
|
buffer[length++] = (nextMsgId >> 8);
|
||
|
|
buffer[length++] = (nextMsgId & 0xFF);
|
||
|
|
length = writeString((char*)topic, buffer,length);
|
||
|
|
buffer[length++] = qos;
|
||
|
|
return write(MQTTSUBSCRIBE|MQTTQOS1,buffer,length-5);
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
boolean PubSubClient::unsubscribe(const char* topic) {
|
||
|
|
if (MQTT_MAX_PACKET_SIZE < 9 + strlen(topic)) {
|
||
|
|
// Too long
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
if (connected()) {
|
||
|
|
uint16_t length = 5;
|
||
|
|
nextMsgId++;
|
||
|
|
if (nextMsgId == 0) {
|
||
|
|
nextMsgId = 1;
|
||
|
|
}
|
||
|
|
buffer[length++] = (nextMsgId >> 8);
|
||
|
|
buffer[length++] = (nextMsgId & 0xFF);
|
||
|
|
length = writeString(topic, buffer,length);
|
||
|
|
return write(MQTTUNSUBSCRIBE|MQTTQOS1,buffer,length-5);
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
void PubSubClient::disconnect() {
|
||
|
|
buffer[0] = MQTTDISCONNECT;
|
||
|
|
buffer[1] = 0;
|
||
|
|
_client->write(buffer,2);
|
||
|
|
_state = MQTT_DISCONNECTED;
|
||
|
|
_client->stop();
|
||
|
|
lastInActivity = lastOutActivity = millis();
|
||
|
|
}
|
||
|
|
|
||
|
|
uint16_t PubSubClient::writeString(const char* string, uint8_t* buf, uint16_t pos) {
|
||
|
|
const char* idp = string;
|
||
|
|
uint16_t i = 0;
|
||
|
|
pos += 2;
|
||
|
|
while (*idp) {
|
||
|
|
buf[pos++] = *idp++;
|
||
|
|
i++;
|
||
|
|
}
|
||
|
|
buf[pos-i-2] = (i >> 8);
|
||
|
|
buf[pos-i-1] = (i & 0xFF);
|
||
|
|
return pos;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
boolean PubSubClient::connected() {
|
||
|
|
boolean rc;
|
||
|
|
if (_client == NULL ) {
|
||
|
|
rc = false;
|
||
|
|
} else {
|
||
|
|
rc = (int)_client->connected();
|
||
|
|
if (!rc) {
|
||
|
|
if (this->_state == MQTT_CONNECTED) {
|
||
|
|
this->_state = MQTT_CONNECTION_LOST;
|
||
|
|
_client->flush();
|
||
|
|
_client->stop();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
PubSubClient& PubSubClient::setServer(uint8_t * ip, uint16_t port) {
|
||
|
|
IPAddress addr(ip[0],ip[1],ip[2],ip[3]);
|
||
|
|
return setServer(addr,port);
|
||
|
|
}
|
||
|
|
|
||
|
|
PubSubClient& PubSubClient::setServer(IPAddress ip, uint16_t port) {
|
||
|
|
this->ip = ip;
|
||
|
|
this->port = port;
|
||
|
|
this->domain = NULL;
|
||
|
|
return *this;
|
||
|
|
}
|
||
|
|
|
||
|
|
PubSubClient& PubSubClient::setServer(const char * domain, uint16_t port) {
|
||
|
|
this->domain = domain;
|
||
|
|
this->port = port;
|
||
|
|
return *this;
|
||
|
|
}
|
||
|
|
|
||
|
|
PubSubClient& PubSubClient::setCallback(MQTT_CALLBACK_SIGNATURE) {
|
||
|
|
this->callback = callback;
|
||
|
|
return *this;
|
||
|
|
}
|
||
|
|
|
||
|
|
PubSubClient& PubSubClient::setClient(Client& client){
|
||
|
|
this->_client = &client;
|
||
|
|
return *this;
|
||
|
|
}
|
||
|
|
|
||
|
|
PubSubClient& PubSubClient::setStream(Stream& stream){
|
||
|
|
this->stream = &stream;
|
||
|
|
return *this;
|
||
|
|
}
|
||
|
|
|
||
|
|
int PubSubClient::state() {
|
||
|
|
return this->_state;
|
||
|
|
}
|