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ESP8266 - fixed MQTT packet length encoding

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This commit is contained in:
Jan Gromeš 2018-07-08 11:41:59 +02:00
parent c4cfa3b94e
commit 79e63ceafd
2 changed files with 37 additions and 34 deletions
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69
src/modules/ESP8266.cpp
View file

@ -294,39 +294,38 @@ uint16_t ESP8266::HttpPost(const char* url, const char* content, String& respons
uint8_t ESP8266::MqttConnect(const char* host, const char* clientId, const char* username, const char* password) {
// encode packet length
uint32_t len = strlen(clientId) + strlen(username) + strlen(password) + 16;
/*uint8_t encoded[] = {0, 0, 0, 0};
MqttEncodeLength(len, encoded);*/
uint8_t encoded[] = {0, 0, 0, 0};
size_t encodedBytes = MqttEncodeLength(len, encoded);
// build the CONNECT packet
uint8_t* packet = new uint8_t[len + 2];
uint8_t* packet = new uint8_t[len + encodedBytes + 2];
packet[0] = (MQTT_CONNECT << 4) & 0xFF;
packet[1] = len;
/*for(uint8_t i = 1; i < 4; i++) {
packet[i] = encoded[i];
}*/
memcpy(packet + 1, encoded, encodedBytes);
packet[2] = 0x00;
packet[3] = 0x04;
packet[4] = 'M';
packet[5] = 'Q';
packet[6] = 'T';
packet[7] = 'T';
packet[8] = 0x04; // protocol level
packet[9] = 0b11000010; // flags: user name + password + clean session
packet[10] = 0x00; // keep-alive interval MSB
packet[11] = 0x3C; // keep-alive interval LSB
packet[encodedBytes + 1] = 0x00;
packet[encodedBytes + 2] = 0x04;
packet[encodedBytes + 3] = 'M';
packet[encodedBytes + 4] = 'Q';
packet[encodedBytes + 5] = 'T';
packet[encodedBytes + 6] = 'T';
packet[12] = 0x00;
packet[13] = strlen(clientId);
memcpy(packet + 14, clientId, strlen(clientId));
packet[encodedBytes + 7] = 0x04; // protocol level
packet[encodedBytes + 8] = 0b11000010; // flags: user name + password + clean session
packet[14 + strlen(clientId)] = 0x00;
packet[15 + strlen(clientId)] = strlen(username);
memcpy(packet + 16 + strlen(clientId), username, strlen(username));
packet[encodedBytes + 9] = 0x00; // keep-alive interval MSB
packet[encodedBytes + 10] = 0x3C; // keep-alive interval LSB
packet[16 + strlen(clientId) + strlen(username)] = 0x00;
packet[17 + strlen(clientId) + strlen(username)] = strlen(password);
memcpy(packet + 18 + strlen(clientId) + strlen(username), password, strlen(password));
packet[encodedBytes + 11] = (strlen(clientId) & 0xFF00) >> 8;
packet[encodedBytes + 12] = strlen(clientId) & 0x00FF;
memcpy(encodedBytes + packet + 13, clientId, strlen(clientId));
packet[encodedBytes + 13 + strlen(clientId)] = (strlen(username) & 0xFF00) >> 8;
packet[encodedBytes + 14 + strlen(clientId)] = strlen(username) & 0x00FF;
memcpy(encodedBytes + packet + 15 + strlen(clientId), username, strlen(username));
packet[encodedBytes + 15 + strlen(clientId) + strlen(username)] = (strlen(password) & 0xFF00) >> 8;;
packet[encodedBytes + 16 + strlen(clientId) + strlen(username)] = strlen(password) & 0x00FF;
memcpy(encodedBytes + packet + 17 + strlen(clientId) + strlen(username), password, strlen(password));
// create TCP connection
uint8_t state = openTransportConnection(host, "TCP", portMqtt, 7200);
@ -364,15 +363,18 @@ uint8_t ESP8266::MqttConnect(const char* host, const char* clientId, const char*
uint8_t ESP8266::MqttPublish(const char* topic, const char* message) {
// encode packet length
uint32_t len = 2 + strlen(topic) + strlen(message);
uint8_t encoded[] = {0, 0, 0, 0};
size_t encodedBytes = MqttEncodeLength(len, encoded);
// build the PUBLISH packet
uint8_t* packet = new uint8_t[len + 2];
packet[0] = (MQTT_PUBLISH << 4);
packet[1] = len;
packet[2] = 0x00;
packet[3] = strlen(topic);
memcpy(packet + 4, topic, strlen(topic));
memcpy(packet + 4 + strlen(topic), message, strlen(message));
memcpy(packet + 1, encoded, encodedBytes);
packet[encodedBytes + 1] = (strlen(topic) & 0xFF00) >> 8;
packet[encodedBytes + 2] = strlen(topic) & 0x00FF;
memcpy(encodedBytes + packet + 3, topic, strlen(topic));
memcpy(encodedBytes + packet + 3 + strlen(topic), message, strlen(message));
// send MQTT packet
uint8_t state = send(packet, len + 2);
@ -486,8 +488,8 @@ uint8_t ESP8266::closeTransportConnection() {
return(ERR_NONE);
}
void ESP8266::MqttEncodeLength(uint32_t len, uint8_t* encoded) {
uint8_t i = 0;
size_t ESP8266::MqttEncodeLength(uint32_t len, uint8_t* encoded) {
size_t i = 0;
do {
encoded[i] = len % 128;
len /= 128;
@ -496,6 +498,7 @@ void ESP8266::MqttEncodeLength(uint32_t len, uint8_t* encoded) {
}
i++;
} while(len > 0);
return(i);
}
uint32_t ESP8266::MqttDecodeLength(uint8_t* encoded) {

2
src/modules/ESP8266.h
View file

@ -49,7 +49,7 @@ class ESP8266 {
private:
Module* _mod;
void MqttEncodeLength(uint32_t len, uint8_t* encoded);
size_t MqttEncodeLength(uint32_t len, uint8_t* encoded);
uint32_t MqttDecodeLength(uint8_t* encoded);
uint16_t getNumBytes(uint32_t timeout = 10000);