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MqttClient.cpp
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/*
This file is part of the ArduinoMqttClient library.
Copyright (c) 2019 Arduino SA. All rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "MqttClient.h"
// #define MQTT_CLIENT_DEBUG
#ifndef htons
#ifdef __ARM__
#define htons __REV16
#else
#define htons(s) ((s<<8) | (s>>8))
#endif
#endif
#ifndef TX_PAYLOAD_BUFFER_SIZE
#ifdef __AVR__
#define TX_PAYLOAD_BUFFER_SIZE 128
#else
#define TX_PAYLOAD_BUFFER_SIZE 256
#endif
#endif
#define MQTT_CONNECT 1
#define MQTT_CONNACK 2
#define MQTT_PUBLISH 3
#define MQTT_PUBACK 4
#define MQTT_PUBREC 5
#define MQTT_PUBREL 6
#define MQTT_PUBCOMP 7
#define MQTT_SUBSCRIBE 8
#define MQTT_SUBACK 9
#define MQTT_UNSUBSCRIBE 10
#define MQTT_UNSUBACK 11
#define MQTT_PINGREQ 12
#define MQTT_PINGRESP 13
#define MQTT_DISCONNECT 14
enum {
MQTT_CLIENT_RX_STATE_READ_TYPE,
MQTT_CLIENT_RX_STATE_READ_REMAINING_LENGTH,
MQTT_CLIENT_RX_STATE_READ_VARIABLE_HEADER,
MQTT_CLIENT_RX_STATE_READ_PUBLISH_TOPIC_LENGTH,
MQTT_CLIENT_RX_STATE_READ_PUBLISH_TOPIC,
MQTT_CLIENT_RX_STATE_READ_PUBLISH_PACKET_ID,
MQTT_CLIENT_RX_STATE_READ_PUBLISH_PAYLOAD,
MQTT_CLIENT_RX_STATE_DISCARD_PUBLISH_PAYLOAD
};
MqttClient::MqttClient(Client* client) :
_client(client),
_onMessage(NULL),
_cleanSession(true),
_keepAliveInterval(60 * 1000L),
_connectionTimeout(30 * 1000L),
_tx_payload_buffer_size(TX_PAYLOAD_BUFFER_SIZE),
_connectError(MQTT_SUCCESS),
_connected(false),
_subscribeQos(0x00),
_rxState(MQTT_CLIENT_RX_STATE_READ_TYPE),
_txBufferIndex(0),
_txPayloadBuffer(NULL),
_txPayloadBufferIndex(0),
_willBuffer(NULL),
_willBufferIndex(0),
_willMessageIndex(0),
_willFlags(0x00)
{
setTimeout(0);
}
MqttClient::MqttClient(Client& client) : MqttClient(&client)
{
}
MqttClient::~MqttClient()
{
if (_willBuffer) {
free(_willBuffer);
_willBuffer = NULL;
}
if (_txPayloadBuffer) {
free(_txPayloadBuffer);
_txPayloadBuffer = NULL;
}
}
#ifdef MQTT_CLIENT_STD_FUNCTION_CALLBACK
void MqttClient::onMessage(MessageCallback callback)
#else
void MqttClient::onMessage(void(*callback)(int))
#endif
{
_onMessage = callback;
}
int MqttClient::parseMessage()
{
if (_rxState == MQTT_CLIENT_RX_STATE_READ_PUBLISH_PAYLOAD) {
// already had a message, but only partially read, discard the data
_rxState = MQTT_CLIENT_RX_STATE_DISCARD_PUBLISH_PAYLOAD;
}
poll();
if (_rxState != MQTT_CLIENT_RX_STATE_READ_PUBLISH_PAYLOAD) {
// message not received or not ready
return 0;
}
return _rxLength;
}
String MqttClient::messageTopic() const
{
if (_rxState == MQTT_CLIENT_RX_STATE_READ_PUBLISH_PAYLOAD) {
// message received and ready for reading
return _rxMessageTopic;
}
return "";
}
int MqttClient::messageDup() const
{
if (_rxState == MQTT_CLIENT_RX_STATE_READ_PUBLISH_PAYLOAD) {
// message received and ready for reading
return _rxMessageDup;
}
return -1;
}
int MqttClient::messageQoS() const
{
if (_rxState == MQTT_CLIENT_RX_STATE_READ_PUBLISH_PAYLOAD) {
// message received and ready for reading
return _rxMessageQoS;
}
return -1;
}
int MqttClient::messageRetain() const
{
if (_rxState == MQTT_CLIENT_RX_STATE_READ_PUBLISH_PAYLOAD) {
// message received and ready for reading
return _rxMessageRetain;
}
return -1;
}
int MqttClient::beginMessage(const char* topic, unsigned long size, bool retain, uint8_t qos, bool dup)
{
_txMessageTopic = topic;
_txMessageRetain = retain;
_txMessageQoS = qos;
_txMessageDup = dup;
_txPayloadBufferIndex = 0;
_txStreamPayload = (size != 0xffffffffL);
if (_txStreamPayload) {
if (!publishHeader(size)) {
stop();
return 0;
}
}
return 1;
}
int MqttClient::beginMessage(const String& topic, unsigned long size, bool retain, uint8_t qos, bool dup)
{
return beginMessage(topic.c_str(), size, retain, qos, dup);
}
int MqttClient::beginMessage(const char* topic, bool retain, uint8_t qos, bool dup)
{
return beginMessage(topic, 0xffffffffL, retain, qos, dup);
}
int MqttClient::beginMessage(const String& topic, bool retain, uint8_t qos, bool dup)
{
return beginMessage(topic.c_str(), retain, qos, dup);
}
int MqttClient::endMessage()
{
if (!_txStreamPayload) {
if (!publishHeader(_txPayloadBufferIndex) ||
(clientWrite(_txPayloadBuffer, _txPayloadBufferIndex) != _txPayloadBufferIndex)) {
stop();
return 0;
}
}
_txStreamPayload = false;
if (_txMessageQoS) {
if (_txMessageQoS == 2) {
// wait for PUBREC
_returnCode = -1;
for (unsigned long start = millis(); ((millis() - start) < _connectionTimeout) && clientConnected();) {
poll();
if (_returnCode != -1) {
if (_returnCode == 0) {
break;
} else {
return 0;
}
}
yield();
}
// reply with PUBREL
pubrel(_txPacketId);
}
// wait for PUBACK or PUBCOMP
_returnCode = -1;
for (unsigned long start = millis(); ((millis() - start) < _connectionTimeout) && clientConnected();) {
poll();
if (_returnCode != -1) {
return (_returnCode == 0);
}
yield();
}
return 0;
}
return 1;
}
/**
* @brief Publish a MQTT message to the broker.
*
* @param topic The topic to publish to.
* @param payload The payload to publish.
* @param retain Publish the MQTT message with the retain flag. Default false.
* @param qos The quality of service of the MQTT message. [0 .. 2]. Default 0.
* @param dup Set or reset the duplicate flag of the MQTT message. Default false (reset).
* @return 0 - Failed to send message.
* 1 - Successfully send message.
*/
int MqttClient::publish(const char* topic, const char* payload, bool retain, uint8_t qos, bool dup) {
int ret = beginMessage(topic, strlen_P(payload), retain, qos, dup);
if (ret) {
print(payload);
ret = endMessage();
}
return ret;
}
/**
* @brief Publish a MQTT message to the broker.
*
* @param topic The topic to publish to.
* @param payload The payload to publish.
* @param retain Publish the MQTT message with the retain flag. Default false.
* @param qos The quality of service of the MQTT message. [0 .. 2]. Default 0.
* @param dup Set or reset the duplicate flag of the MQTT message. Default false (reset).
* @return 0 - Failed to send message.
* 1 - Successfully send message.
*/
int MqttClient::publish(const String& topic, const char* payload, bool retain, uint8_t qos, bool dup) {
return publish(topic.c_str(), payload, retain, qos, dup);
}
/**
* @brief Publish a MQTT message to the broker.
*
* @param topic The topic to publish to.
* @param payload The payload to publish.
* @param retain Publish the MQTT message with the retain flag. Default false.
* @param qos The quality of service of the MQTT message. [0 .. 2]. Default 0.
* @param dup Set or reset the duplicate flag of the MQTT message. Default false (reset).
* @return 0 - Failed to send message.
* 1 - Successfully send message.
*/
int MqttClient::publish(const char* topic, String& payload, bool retain, uint8_t qos, bool dup) {
return publish(topic, payload.c_str(), retain, qos, dup);
}
/**
* @brief Publish a MQTT message to the broker.
*
* @param topic The topic to publish to.
* @param payload The payload to publish.
* @param retain Publish the MQTT message with the retain flag. Default false.
* @param qos The quality of service of the MQTT message. [0 .. 2]. Default 0.
* @param dup Set or reset the duplicate flag of the MQTT message. Default false (reset).
* @return 0 - Failed to send message.
* 1 - Successfully send message.
*/
int MqttClient::publish(const String& topic, String& payload, bool retain, uint8_t qos, bool dup) {
return publish(topic.c_str(), payload.c_str(), retain, qos, dup);
}
int MqttClient::beginWill(const char* topic, unsigned short size, bool retain, uint8_t qos)
{
int topicLength = strlen(topic);
size_t willLength = (2 + topicLength + 2 + size);
if (qos > 2) {
// invalid QoS
}
_willBuffer = (uint8_t*)realloc(_willBuffer, willLength);
_txBuffer = _willBuffer;
_txBufferIndex = 0;
writeString(topic, topicLength);
write16(0); // dummy size for now
_willMessageIndex = _txBufferIndex;
_willFlags = (qos << 3) | 0x04;
if (retain) {
_willFlags |= 0x20;
}
return 0;
}
int MqttClient::beginWill(const String& topic, unsigned short size, bool retain, uint8_t qos)
{
return beginWill(topic.c_str(), size, retain, qos);
}
int MqttClient::beginWill(const char* topic, bool retain, uint8_t qos)
{
return beginWill(topic, _tx_payload_buffer_size, retain, qos);
}
int MqttClient::beginWill(const String& topic, bool retain, uint8_t qos)
{
return beginWill(topic.c_str(), retain, qos);
}
int MqttClient::endWill()
{
// update the index
_willBufferIndex = _txBufferIndex;
// update the will message size
_txBufferIndex = (_willMessageIndex - 2);
write16(_willBufferIndex - _willMessageIndex);
_txBuffer = NULL;
_willMessageIndex = 0;
return 1;
}
int MqttClient::subscribe(const char* topic, uint8_t qos)
{
int topicLength = strlen(topic);
int remainingLength = topicLength + 5;
if (qos > 2) {
// invalid QoS
return 0;
}
_txPacketId++;
if (_txPacketId == 0) {
_txPacketId = 1;
}
uint8_t packetBuffer[5 + remainingLength];
beginPacket(MQTT_SUBSCRIBE, 0x02, remainingLength, packetBuffer);
write16(_txPacketId);
writeString(topic, topicLength);
write8(qos);
if (!endPacket()) {
stop();
return 0;
}
_returnCode = -1;
_subscribeQos = 0x80;
for (unsigned long start = millis(); ((millis() - start) < _connectionTimeout) && clientConnected();) {
poll();
if (_returnCode != -1) {
_subscribeQos = _returnCode;
return (_returnCode >= 0 && _returnCode <= 2);
}
yield();
}
stop();
return 0;
}
int MqttClient::subscribe(const String& topic, uint8_t qos)
{
return subscribe(topic.c_str(), qos);
}
int MqttClient::unsubscribe(const char* topic)
{
int topicLength = strlen(topic);
int remainingLength = topicLength + 4;
_txPacketId++;
if (_txPacketId == 0) {
_txPacketId = 1;
}
uint8_t packetBuffer[5 + remainingLength];
beginPacket(MQTT_UNSUBSCRIBE, 0x02, remainingLength, packetBuffer);
write16(_txPacketId);
writeString(topic, topicLength);
if (!endPacket()) {
stop();
return 0;
}
_returnCode = -1;
for (unsigned long start = millis(); ((millis() - start) < _connectionTimeout) && clientConnected();) {
poll();
if (_returnCode != -1) {
return (_returnCode == 0);
}
yield();
}
stop();
return 0;
}
int MqttClient::unsubscribe(const String& topic)
{
return unsubscribe(topic.c_str());
}
void MqttClient::poll()
{
if (clientAvailable() == 0 && !clientConnected()) {
_rxState = MQTT_CLIENT_RX_STATE_READ_TYPE;
_connected = false;
}
while (clientAvailable()) {
byte b = clientRead();
_lastRx = millis();
switch (_rxState) {
case MQTT_CLIENT_RX_STATE_READ_TYPE: {
_rxType = (b >> 4);
_rxFlags = (b & 0x0f);
_rxLength = 0;
_rxLengthMultiplier = 1;
_rxState = MQTT_CLIENT_RX_STATE_READ_REMAINING_LENGTH;
break;
}
case MQTT_CLIENT_RX_STATE_READ_REMAINING_LENGTH: {
_rxLength += (b & 0x7f) * _rxLengthMultiplier;
_rxLengthMultiplier *= 128;
if (_rxLengthMultiplier > (128 * 128 * 128L)) {
// malformed
stop();
return;
}
if ((b & 0x80) == 0) { // length done
bool malformedResponse = false;
if (_rxType == MQTT_CONNACK ||
_rxType == MQTT_PUBACK ||
_rxType == MQTT_PUBREC ||
_rxType == MQTT_PUBCOMP ||
_rxType == MQTT_UNSUBACK) {
malformedResponse = (_rxFlags != 0x00 || _rxLength != 2);
} else if (_rxType == MQTT_PUBLISH) {
malformedResponse = ((_rxFlags & 0x06) == 0x06);
} else if (_rxType == MQTT_PUBREL) {
malformedResponse = (_rxFlags != 0x02 || _rxLength != 2);
} else if (_rxType == MQTT_SUBACK) {
malformedResponse = (_rxFlags != 0x00 || _rxLength != 3);
} else if (_rxType == MQTT_PINGRESP) {
malformedResponse = (_rxFlags != 0x00 || _rxLength != 0);
} else {
// unexpected type
malformedResponse = true;
}
if (malformedResponse) {
stop();
return;
}
if (_rxType == MQTT_PUBLISH) {
_rxMessageDup = (_rxFlags & 0x80) != 0;
_rxMessageQoS = (_rxFlags >> 1) & 0x03;
_rxMessageRetain = (_rxFlags & 0x01);
_rxState = MQTT_CLIENT_RX_STATE_READ_PUBLISH_TOPIC_LENGTH;
} else if (_rxLength == 0) {
_rxState = MQTT_CLIENT_RX_STATE_READ_TYPE;
} else {
_rxState = MQTT_CLIENT_RX_STATE_READ_VARIABLE_HEADER;
}
_rxMessageIndex = 0;
}
break;
}
case MQTT_CLIENT_RX_STATE_READ_VARIABLE_HEADER: {
_rxMessageBuffer[_rxMessageIndex++] = b;
if (_rxMessageIndex == _rxLength) {
_rxState = MQTT_CLIENT_RX_STATE_READ_TYPE;
if (_rxType == MQTT_CONNACK) {
_returnCode = _rxMessageBuffer[1];
} else if (_rxType == MQTT_PUBACK ||
_rxType == MQTT_PUBREC ||
_rxType == MQTT_PUBCOMP ||
_rxType == MQTT_UNSUBACK) {
uint16_t packetId = (_rxMessageBuffer[0] << 8) | _rxMessageBuffer[1];
if (packetId == _txPacketId) {
_returnCode = 0;
}
} else if (_rxType == MQTT_PUBREL) {
uint16_t packetId = (_rxMessageBuffer[0] << 8) | _rxMessageBuffer[1];
if (_txStreamPayload) {
// ignore, can't send as in the middle of a publish
} else {
pubcomp(packetId);
}
} else if (_rxType == MQTT_SUBACK) {
uint16_t packetId = (_rxMessageBuffer[0] << 8) | _rxMessageBuffer[1];
if (packetId == _txPacketId) {
_returnCode = _rxMessageBuffer[2];
}
}
}
break;
}
case MQTT_CLIENT_RX_STATE_READ_PUBLISH_TOPIC_LENGTH: {
_rxMessageBuffer[_rxMessageIndex++] = b;
if (_rxMessageIndex == 2) {
_rxMessageTopicLength = (_rxMessageBuffer[0] << 8) | _rxMessageBuffer[1];
_rxLength -= 2;
_rxMessageTopic = "";
_rxMessageTopic.reserve(_rxMessageTopicLength);
if (_rxMessageQoS) {
if (_rxLength < (_rxMessageTopicLength + 2)) {
stop();
return;
}
} else {
if (_rxLength < _rxMessageTopicLength) {
stop();
return;
}
}
_rxMessageIndex = 0;
_rxState = MQTT_CLIENT_RX_STATE_READ_PUBLISH_TOPIC;
}
break;
}
case MQTT_CLIENT_RX_STATE_READ_PUBLISH_TOPIC: {
_rxMessageTopic += (char)b;
if (_rxMessageTopicLength == _rxMessageTopic.length()) {
_rxLength -= _rxMessageTopicLength;
if (_rxMessageQoS) {
_rxState = MQTT_CLIENT_RX_STATE_READ_PUBLISH_PACKET_ID;
} else {
_rxState = MQTT_CLIENT_RX_STATE_READ_PUBLISH_PAYLOAD;
if (_onMessage) {
#ifdef MQTT_CLIENT_STD_FUNCTION_CALLBACK
_onMessage(this,_rxLength);
#else
_onMessage(_rxLength);
#endif
if (_rxLength == 0) {
_rxState = MQTT_CLIENT_RX_STATE_READ_TYPE;
}
}
}
}
break;
}
case MQTT_CLIENT_RX_STATE_READ_PUBLISH_PACKET_ID: {
_rxMessageBuffer[_rxMessageIndex++] = b;
if (_rxMessageIndex == 2) {
_rxLength -= 2;
_rxPacketId = (_rxMessageBuffer[0] << 8) | _rxMessageBuffer[1];
_rxState = MQTT_CLIENT_RX_STATE_READ_PUBLISH_PAYLOAD;
if (_onMessage) {
#ifdef MQTT_CLIENT_STD_FUNCTION_CALLBACK
_onMessage(this,_rxLength);
#else
_onMessage(_rxLength);
#endif
}
if (_rxLength == 0) {
// no payload to read, ack zero length message
ackRxMessage();
if (_onMessage) {
_rxState = MQTT_CLIENT_RX_STATE_READ_TYPE;
}
}
}
break;
}
case MQTT_CLIENT_RX_STATE_READ_PUBLISH_PAYLOAD:
case MQTT_CLIENT_RX_STATE_DISCARD_PUBLISH_PAYLOAD: {
if (_rxLength > 0) {
_rxLength--;
}
if (_rxLength == 0) {
_rxState = MQTT_CLIENT_RX_STATE_READ_TYPE;
} else {
_rxState = MQTT_CLIENT_RX_STATE_DISCARD_PUBLISH_PAYLOAD;
}
break;
}
}
if (_rxState == MQTT_CLIENT_RX_STATE_READ_PUBLISH_PAYLOAD) {
break;
}
}
if (_connected) {
unsigned long now = millis();
if ((now - _lastPingTx) >= _keepAliveInterval) {
_lastPingTx = now;
ping();
} else if ((now - _lastRx) >= (_keepAliveInterval * 2)) {
stop();
}
}
}
int MqttClient::connect(IPAddress ip, uint16_t port)
{
return connect(ip, NULL, port);
}
int MqttClient::connect(const char *host, uint16_t port)
{
return connect((uint32_t)0, host, port);
}
size_t MqttClient::write(uint8_t b)
{
return write(&b, sizeof(b));
}
size_t MqttClient::write(const uint8_t *buf, size_t size)
{
if (_willMessageIndex) {
return writeData(buf, size);
}
if (_txStreamPayload) {
return clientWrite(buf, size);
}
if ((_txPayloadBufferIndex + size) >= _tx_payload_buffer_size) {
size = (_tx_payload_buffer_size - _txPayloadBufferIndex);
}
if (_txPayloadBuffer == NULL) {
_txPayloadBuffer = (uint8_t*)malloc(_tx_payload_buffer_size);
}
memcpy(&_txPayloadBuffer[_txPayloadBufferIndex], buf, size);
_txPayloadBufferIndex += size;
return size;
}
int MqttClient::available()
{
if (_rxState == MQTT_CLIENT_RX_STATE_READ_PUBLISH_PAYLOAD) {
return _rxLength;
}
return 0;
}
int MqttClient::read()
{
byte b;
if (read(&b, sizeof(b)) != sizeof(b)) {
return -1;
}
return b;
}
int MqttClient::read(uint8_t *buf, size_t size)
{
size_t result = 0;
if (_rxState == MQTT_CLIENT_RX_STATE_READ_PUBLISH_PAYLOAD) {
size_t avail = available();
if (size > avail) {
size = avail;
}
while (result < size) {
int b = clientTimedRead();
if (b == -1) {
break;
}
result++;
*buf++ = b;
}
if (result > 0) {
_rxLength -= result;
if (_rxLength == 0) {
ackRxMessage();
_rxState = MQTT_CLIENT_RX_STATE_READ_TYPE;
}
}
}
return result;
}
int MqttClient::peek()
{
if (_rxState == MQTT_CLIENT_RX_STATE_READ_PUBLISH_PAYLOAD) {
return clientPeek();
}
return -1;
}
void MqttClient::flush()
{
}
void MqttClient::stop()
{
if (connected()) {
disconnect();
}
_connected = false;
_client->stop();
}
uint8_t MqttClient::connected()
{
return clientConnected() && _connected;
}
MqttClient::operator bool()
{
return true;
}
void MqttClient::setId(const char* id)
{
_id = id;
}
void MqttClient::setId(const String& id)
{
_id = id;
}
void MqttClient::setUsernamePassword(const char* username, const char* password)
{
_username = username;
_password = password;
}
void MqttClient::setUsernamePassword(const String& username, const String& password)
{
_username = username;
_password = password;
}
void MqttClient::setCleanSession(bool cleanSession)
{
_cleanSession = cleanSession;
}
void MqttClient::setKeepAliveInterval(unsigned long interval)
{
_keepAliveInterval = interval;
}
void MqttClient::setConnectionTimeout(unsigned long timeout)
{
_connectionTimeout = timeout;
}
void MqttClient::setTxPayloadSize(unsigned short size)
{
if (_txPayloadBuffer) {
free(_txPayloadBuffer);
_txPayloadBuffer = NULL;
_txPayloadBufferIndex = 0;
}
_tx_payload_buffer_size = size;
}
int MqttClient::connectError() const
{
return _connectError;
}
int MqttClient::subscribeQoS() const
{
return _subscribeQos;
}
int MqttClient::connect(IPAddress ip, const char* host, uint16_t port)
{
if (clientConnected()) {
_client->stop();
}
_rxState = MQTT_CLIENT_RX_STATE_READ_TYPE;
_connected = false;
_txPacketId = 0x0000;
if (host) {
if (!_client->connect(host, port)) {
_connectError = MQTT_CONNECTION_REFUSED;
return 0;
}
} else {
if (!_client->connect(ip, port)) {
_connectError = MQTT_CONNECTION_REFUSED;
return 0;
}
}
_lastRx = millis();
String id = _id;
int idLength = id.length();
int usernameLength = _username.length();
int passwordLength = _password.length();
uint8_t flags = 0;
if (idLength == 0) {
char tempId[17];
snprintf(tempId, sizeof(tempId), "Arduino-%.8lx", millis());
id = tempId;
idLength = sizeof(tempId) - 1;
}
struct __attribute__ ((packed)) {
struct {
uint16_t length;
char value[4];
} protocolName;
uint8_t level;
uint8_t flags;
uint16_t keepAlive;
} connectVariableHeader;
size_t remainingLength = sizeof(connectVariableHeader) + (2 + idLength) + _willBufferIndex;
if (usernameLength) {
flags |= 0x80;
remainingLength += (2 + usernameLength);
}
if (passwordLength) {
flags |= 0x40;
remainingLength += (2 + passwordLength);
}
flags |= _willFlags;
if (_cleanSession) {
flags |= 0x02; // clean session
}
connectVariableHeader.protocolName.length = htons(sizeof(connectVariableHeader.protocolName.value));
memcpy(connectVariableHeader.protocolName.value, "MQTT", sizeof(connectVariableHeader.protocolName.value));
connectVariableHeader.level = 0x04;
connectVariableHeader.flags = flags;
connectVariableHeader.keepAlive = htons(_keepAliveInterval / 1000);
uint8_t packetBuffer[5 + remainingLength];
beginPacket(MQTT_CONNECT, 0x00, remainingLength, packetBuffer);
writeData(&connectVariableHeader, sizeof(connectVariableHeader));
writeString(id.c_str(), idLength);
if (_willBufferIndex) {
writeData(_willBuffer, _willBufferIndex);
}
if (usernameLength) {
writeString(_username.c_str(), usernameLength);
}
if (passwordLength) {
writeString(_password.c_str(), passwordLength);
}
if (!endPacket()) {
_client->stop();
_connectError = MQTT_SERVER_UNAVAILABLE;
return 0;
}