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ESP8266 - Implemented MQTT ping

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This commit is contained in:
Jan Gromeš 2018-07-10 10:21:34 +02:00
parent 9cbebb3c4e
commit a56f0122d6
2 changed files with 34 additions and 1 deletions
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32
src/modules/ESP8266.cpp
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@ -582,6 +582,38 @@ uint8_t ESP8266::MqttUnsubscribe(const char* topicFilter) {
return(ERR_RESPONSE_MALFORMED);
}
uint8_t ESP8266::MqttPing() {
// build the PINGREQ packet
uint8_t packet[2];
// fixed header
packet[0] = (MQTT_PINGREQ << 4) | 0b0000;
packet[1] = 0x00;
// send MQTT packet
uint8_t state = send(packet, 2);
if(state != ERR_NONE) {
return(state);
}
// get the response length (MQTT PINGRESP response has to be 2 bytes long)
uint16_t numBytes = getNumBytes();
if(numBytes != 2) {
return(ERR_RESPONSE_MALFORMED_AT);
}
// read the response
uint8_t* response = new uint8_t[numBytes];
receive(response, numBytes);
if((response[0] == MQTT_PINGRESP << 4) && (response[1] == 0)) {
delete[] response;
return(ERR_NONE);
}
delete[] response;
return(ERR_RESPONSE_MALFORMED);
}
uint8_t ESP8266::send(const char* data) {
// build AT command
char lenStr[8];

3
src/modules/ESP8266.h
View file

@ -48,6 +48,7 @@ class ESP8266 {
uint8_t MqttPublish(const char* topic, const char* message);
uint8_t MqttSubscribe(const char* topicFilter);
uint8_t MqttUnsubscribe(const char* topicFilter);
uint8_t MqttPing();
// Transport layer methods
uint8_t openTransportConnection(const char* host, const char* protocol, uint16_t port, uint16_t tcpKeepAlive = 0);
@ -64,7 +65,7 @@ class ESP8266 {
size_t MqttEncodeLength(uint32_t len, uint8_t* encoded);
uint32_t MqttDecodeLength(uint8_t* encoded);
uint16_t getNumBytes(uint32_t timeout = 10000);
uint16_t getNumBytes(uint32_t timeout = 10000, size_t minBytes = 10);
};
#endif