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battletank/arduino/libraries/Temboo/src/utility/MQTTClient.h

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/*******************************************************************************
* Copyright (c) 2014, 2015 IBM Corp.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and Eclipse Distribution License v1.0 which accompany this distribution.
*
* The Eclipse Public License is available at
* http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Ian Craggs - initial API and implementation and/or initial documentation
* Ian Craggs - fix for bug 458512 - QoS 2 messages
* Ian Craggs - fix for bug 460389 - send loop uses wrong length
* Ian Craggs - fix for bug 464169 - clearing subscriptions
* Ian Craggs - fix for bug 464551 - enums and ints can be different size
*******************************************************************************/
#if !defined(MQTTCLIENT_H)
#define MQTTCLIENT_H
#include "FP.h"
#include "MQTTPacket.h"
#include "stdio.h"
#include "MQTTLogging.h"
#if !defined(MQTTCLIENT_QOS1)
#define MQTTCLIENT_QOS1 1
#endif
#if !defined(MQTTCLIENT_QOS2)
#define MQTTCLIENT_QOS2 0
#endif
namespace MQTT
{
enum QoS { QOS0, QOS1, QOS2 };
// all failure return codes must be negative
enum returnCode { BUFFER_OVERFLOW = -2, FAILURE = -1, SUCCESS = 0 };
struct Message
{
enum QoS qos;
bool retained;
bool dup;
unsigned short id;
void *payload;
size_t payloadlen;
};
struct MessageData
{
MessageData(MQTTString &aTopicName, struct Message &aMessage) : message(aMessage), topicName(aTopicName)
{ }
struct Message &message;
MQTTString &topicName;
};
class PacketId
{
public:
PacketId()
{
next = 0;
}
int getNext()
{
next = (next == MAX_PACKET_ID) ? 1 : next + 1;
return next;
}
private:
static const int MAX_PACKET_ID = 65535;
int next;
};
/**
* @class Client
* @brief blocking, non-threaded MQTT client API
*
* This version of the API blocks on all method calls, until they are complete. This means that only one
* MQTT request can be in process at any one time.
* @param Network a network class which supports send, receive
* @param Timer a timer class with the methods:
*/
template<class Network, class Timer, int MAX_MQTT_PACKET_SIZE = 100, int MAX_MESSAGE_HANDLERS = 5>
class Client
{
public:
typedef void (*messageHandler)(MessageData&);
/** Construct the client
* @param network - pointer to an instance of the Network class - must be connected to the endpoint
* before calling MQTT connect
* @param limits an instance of the Limit class - to alter limits as required
*/
Client(Network& network, unsigned int command_timeout_ms = 30000);
/** Set the default message handling callback - used for any message which does not match a subscription message handler
* @param mh - pointer to the callback function
*/
void setDefaultMessageHandler(messageHandler mh)
{
defaultMessageHandler.attach(mh);
}
/** MQTT Connect - send an MQTT connect packet down the network and wait for a Connack
* The nework object must be connected to the network endpoint before calling this
* Default connect options are used
* @return success code -
*/
int connect();
/** MQTT Connect - send an MQTT connect packet down the network and wait for a Connack
* The nework object must be connected to the network endpoint before calling this
* @param options - connect options
* @return success code -
*/
int connect(MQTTPacket_connectData& options);
/** MQTT Publish - send an MQTT publish packet and wait for all acks to complete for all QoSs
* @param topic - the topic to publish to
* @param message - the message to send
* @return success code -
*/
int publish(const char* topicName, Message& message);
/** MQTT Publish - send an MQTT publish packet and wait for all acks to complete for all QoSs
* @param topic - the topic to publish to
* @param payload - the data to send
* @param payloadlen - the length of the data
* @param qos - the QoS to send the publish at
* @param retained - whether the message should be retained
* @return success code -
*/
int publish(const char* topicName, void* payload, size_t payloadlen, enum QoS qos = QOS0, bool retained = false);
/** MQTT Publish - send an MQTT publish packet and wait for all acks to complete for all QoSs
* @param topic - the topic to publish to
* @param payload - the data to send
* @param payloadlen - the length of the data
* @param id - the packet id used - returned
* @param qos - the QoS to send the publish at
* @param retained - whether the message should be retained
* @return success code -
*/
int publish(const char* topicName, void* payload, size_t payloadlen, unsigned short& id, enum QoS qos = QOS1, bool retained = false);
/** MQTT Subscribe - send an MQTT subscribe packet and wait for the suback
* @param topicFilter - a topic pattern which can include wildcards
* @param qos - the MQTT QoS to subscribe at
* @param mh - the callback function to be invoked when a message is received for this subscription
* @return success code -
*/
int subscribe(const char* topicFilter, enum QoS qos, messageHandler mh);
/** MQTT Unsubscribe - send an MQTT unsubscribe packet and wait for the unsuback
* @param topicFilter - a topic pattern which can include wildcards
* @return success code -
*/
int unsubscribe(const char* topicFilter);
/** MQTT Disconnect - send an MQTT disconnect packet, and clean up any state
* @return success code -
*/
int disconnect();
/** A call to this API must be made within the keepAlive interval to keep the MQTT connection alive
* yield can be called if no other MQTT operation is needed. This will also allow messages to be
* received.
* @param timeout_ms the time to wait, in milliseconds
* @return success code - on failure, this means the client has disconnected
*/
int yield(unsigned long timeout_ms = 1000L);
/** Is the client connected?
* @return flag - is the client connected or not?
*/
bool isConnected()
{
return isconnected;
}
private:
void cleanSession();
int cycle(Timer& timer);
int waitfor(int packet_type, Timer& timer);
int keepalive();
int publish(int len, Timer& timer, enum QoS qos);
int decodePacket(int* value, int timeout);
int readPacket(Timer& timer);
int sendPacket(int length, Timer& timer);
int deliverMessage(MQTTString& topicName, Message& message);
bool isTopicMatched(char* topicFilter, MQTTString& topicName);
Network& ipstack;
unsigned long command_timeout_ms;
unsigned char sendbuf[MAX_MQTT_PACKET_SIZE];
unsigned char readbuf[MAX_MQTT_PACKET_SIZE];
Timer last_sent, last_received;
unsigned int keepAliveInterval;
bool ping_outstanding;
bool cleansession;
PacketId packetid;
struct MessageHandlers
{
const char* topicFilter;
FP<void, MessageData&> fp;
} messageHandlers[MAX_MESSAGE_HANDLERS]; // Message handlers are indexed by subscription topic
FP<void, MessageData&> defaultMessageHandler;
bool isconnected;
#if MQTTCLIENT_QOS1 || MQTTCLIENT_QOS2
unsigned char pubbuf[MAX_MQTT_PACKET_SIZE]; // store the last publish for sending on reconnect
int inflightLen;
unsigned short inflightMsgid;
enum QoS inflightQoS;
#endif
#if MQTTCLIENT_QOS2
bool pubrel;
#if !defined(MAX_INCOMING_QOS2_MESSAGES)
#define MAX_INCOMING_QOS2_MESSAGES 10
#endif
unsigned short incomingQoS2messages[MAX_INCOMING_QOS2_MESSAGES];
bool isQoS2msgidFree(unsigned short id);
bool useQoS2msgid(unsigned short id);
void freeQoS2msgid(unsigned short id);
#endif
};
}
template<class Network, class Timer, int a, int MAX_MESSAGE_HANDLERS>
void MQTT::Client<Network, Timer, a, MAX_MESSAGE_HANDLERS>::cleanSession()
{
ping_outstanding = false;
for (int i = 0; i < MAX_MESSAGE_HANDLERS; ++i)
messageHandlers[i].topicFilter = 0;
isconnected = false;
#if MQTTCLIENT_QOS1 || MQTTCLIENT_QOS2
inflightMsgid = 0;
inflightQoS = QOS0;
#endif
#if MQTTCLIENT_QOS2
pubrel = false;
for (int i = 0; i < MAX_INCOMING_QOS2_MESSAGES; ++i)
incomingQoS2messages[i] = 0;
#endif
}
template<class Network, class Timer, int a, int MAX_MESSAGE_HANDLERS>
MQTT::Client<Network, Timer, a, MAX_MESSAGE_HANDLERS>::Client(Network& network, unsigned int command_timeout_ms) : ipstack(network), packetid()
{
last_sent = Timer();
last_received = Timer();
this->command_timeout_ms = command_timeout_ms;
cleanSession();
}
#if MQTTCLIENT_QOS2
template<class Network, class Timer, int a, int b>
bool MQTT::Client<Network, Timer, a, b>::isQoS2msgidFree(unsigned short id)
{
for (int i = 0; i < MAX_INCOMING_QOS2_MESSAGES; ++i)
{
if (incomingQoS2messages[i] == id)
return false;
}
return true;
}
template<class Network, class Timer, int a, int b>
bool MQTT::Client<Network, Timer, a, b>::useQoS2msgid(unsigned short id)
{
for (int i = 0; i < MAX_INCOMING_QOS2_MESSAGES; ++i)
{
if (incomingQoS2messages[i] == 0)
{
incomingQoS2messages[i] = id;
return true;
}
}
return false;
}
template<class Network, class Timer, int a, int b>
void MQTT::Client<Network, Timer, a, b>::freeQoS2msgid(unsigned short id)
{
for (int i = 0; i < MAX_INCOMING_QOS2_MESSAGES; ++i)
{
if (incomingQoS2messages[i] == id)
{
incomingQoS2messages[i] = 0;
return;
}
}
}
#endif
template<class Network, class Timer, int a, int b>
int MQTT::Client<Network, Timer, a, b>::sendPacket(int length, Timer& timer)
{
int rc = FAILURE,
sent = 0;
while (sent < length && !timer.expired())
{
rc = ipstack.write(&sendbuf[sent], length - sent, timer.left_ms());
if (rc < 0) // there was an error writing the data
break;
sent += rc;
}
if (sent == length)
{
if (this->keepAliveInterval > 0)
last_sent.countdown(this->keepAliveInterval); // record the fact that we have successfully sent the packet
rc = SUCCESS;
}
else
rc = FAILURE;
#if defined(MQTT_DEBUG)
char printbuf[150];
DEBUG("Rc %d from sending packet %s\n", rc, MQTTFormat_toServerString(printbuf, sizeof(printbuf), sendbuf, length));
#endif
return rc;
}
template<class Network, class Timer, int a, int b>
int MQTT::Client<Network, Timer, a, b>::decodePacket(int* value, int timeout)
{
unsigned char c;
int multiplier = 1;
int len = 0;
const int MAX_NO_OF_REMAINING_LENGTH_BYTES = 4;
*value = 0;
do
{
int rc = MQTTPACKET_READ_ERROR;
if (++len > MAX_NO_OF_REMAINING_LENGTH_BYTES)
{
rc = MQTTPACKET_READ_ERROR; /* bad data */
goto exit;
}
rc = ipstack.read(&c, 1, timeout);
if (rc != 1)
goto exit;
*value += (c & 127) * multiplier;
multiplier *= 128;
} while ((c & 128) != 0);
exit:
return len;
}
/**
* If any read fails in this method, then we should disconnect from the network, as on reconnect
* the packets can be retried.
* @param timeout the max time to wait for the packet read to complete, in milliseconds
* @return the MQTT packet type, or -1 if none
*/
template<class Network, class Timer, int MAX_MQTT_PACKET_SIZE, int b>
int MQTT::Client<Network, Timer, MAX_MQTT_PACKET_SIZE, b>::readPacket(Timer& timer)
{
int rc = FAILURE;
MQTTHeader header = {0};
int len = 0;
int rem_len = 0;
/* 1. read the header byte. This has the packet type in it */
if (ipstack.read(readbuf, 1, timer.left_ms()) != 1)
goto exit;
len = 1;
/* 2. read the remaining length. This is variable in itself */
decodePacket(&rem_len, timer.left_ms());
len += MQTTPacket_encode(readbuf + 1, rem_len); /* put the original remaining length into the buffer */
if (rem_len > (MAX_MQTT_PACKET_SIZE - len))
{
rc = BUFFER_OVERFLOW;
}
/* 3. read the rest of the buffer using a callback to supply the rest of the data */
if (rc == BUFFER_OVERFLOW) {
if (rem_len > 0 && (ipstack.read(readbuf + len, MAX_MQTT_PACKET_SIZE - len, timer.left_ms()) != (MAX_MQTT_PACKET_SIZE - len)))
goto exit;
readbuf[MAX_MQTT_PACKET_SIZE-1] = '\0';
rem_len = rem_len - MAX_MQTT_PACKET_SIZE - len;
while(rem_len--) {
unsigned char c;
ipstack.read(&c, 1, timer.left_ms() );
}
}
else {
if (rem_len > 0 && (ipstack.read(readbuf + len, rem_len, timer.left_ms()) != rem_len))
goto exit;
header.byte = readbuf[0];
rc = header.bits.type;
}
if (this->keepAliveInterval > 0)
last_received.countdown(this->keepAliveInterval); // record the fact that we have successfully received a packet
exit:
#if defined(MQTT_DEBUG)
if (rc >= 0)
{
char printbuf[50];
DEBUG("Rc %d from receiving packet %s\n", rc, MQTTFormat_toClientString(printbuf, sizeof(printbuf), readbuf, len));
}
#endif
return rc;
}
// assume topic filter and name is in correct format
// # can only be at end
// + and # can only be next to separator
template<class Network, class Timer, int a, int b>
bool MQTT::Client<Network, Timer, a, b>::isTopicMatched(char* topicFilter, MQTTString& topicName)
{
char* curf = topicFilter;
char* curn = topicName.lenstring.data;
char* curn_end = curn + topicName.lenstring.len;
while (*curf && curn < curn_end)
{
if (*curn == '/' && *curf != '/')
break;
if (*curf != '+' && *curf != '#' && *curf != *curn)
break;
if (*curf == '+')
{ // skip until we meet the next separator, or end of string
char* nextpos = curn + 1;
while (nextpos < curn_end && *nextpos != '/')
nextpos = ++curn + 1;
}
else if (*curf == '#')
curn = curn_end - 1; // skip until end of string
curf++;
curn++;
};
return (curn == curn_end) && (*curf == '\0');
}
template<class Network, class Timer, int a, int MAX_MESSAGE_HANDLERS>
int MQTT::Client<Network, Timer, a, MAX_MESSAGE_HANDLERS>::deliverMessage(MQTTString& topicName, Message& message)
{
int rc = FAILURE;
// we have to find the right message handler - indexed by topic
for (int i = 0; i < MAX_MESSAGE_HANDLERS; ++i)
{
if (messageHandlers[i].topicFilter != 0 && (MQTTPacket_equals(&topicName, (char*)messageHandlers[i].topicFilter) ||
isTopicMatched((char*)messageHandlers[i].topicFilter, topicName)))
{
if (messageHandlers[i].fp.attached())
{
MessageData md(topicName, message);
messageHandlers[i].fp(md);
rc = SUCCESS;
}
}
}
if (rc == FAILURE && defaultMessageHandler.attached())
{
MessageData md(topicName, message);
defaultMessageHandler(md);
rc = SUCCESS;
}
return rc;
}
template<class Network, class Timer, int a, int b>
int MQTT::Client<Network, Timer, a, b>::yield(unsigned long timeout_ms)
{
int rc = SUCCESS;
Timer timer = Timer();
timer.countdown_ms(timeout_ms);
while (!timer.expired())
{
if (cycle(timer) < 0)
{
rc = FAILURE;
break;
}
}
return rc;
}
template<class Network, class Timer, int MAX_MQTT_PACKET_SIZE, int b>
int MQTT::Client<Network, Timer, MAX_MQTT_PACKET_SIZE, b>::cycle(Timer& timer)
{
/* get one piece of work off the wire and one pass through */
// read the socket, see what work is due
int packet_type = readPacket(timer);
int rc = SUCCESS;
if (packet_type == BUFFER_OVERFLOW) {
MQTTHeader header = {0};
header.byte = readbuf[0];
packet_type = header.bits.type;
}
int len = 0;
switch (packet_type)
{
case FAILURE:
case BUFFER_OVERFLOW:
rc = packet_type;
break;
case CONNACK:
case PUBACK:
case SUBACK:
break;
case PUBLISH:
{
MQTTString topicName = MQTTString_initializer;
Message msg;
int intQoS;
if (MQTTDeserialize_publish((unsigned char*)&msg.dup, &intQoS, (unsigned char*)&msg.retained, (unsigned short*)&msg.id, &topicName,
(unsigned char**)&msg.payload, (int*)&msg.payloadlen, readbuf, MAX_MQTT_PACKET_SIZE) != 1)
goto exit;
msg.qos = (enum QoS)intQoS;
#if MQTTCLIENT_QOS2
if (msg.qos != QOS2)
#endif
deliverMessage(topicName, msg);
#if MQTTCLIENT_QOS2
else if (isQoS2msgidFree(msg.id))
{
if (useQoS2msgid(msg.id))
deliverMessage(topicName, msg);
else
WARN("Maximum number of incoming QoS2 messages exceeded");
}
#endif
#if MQTTCLIENT_QOS1 || MQTTCLIENT_QOS2
if (msg.qos != QOS0)
{
if (msg.qos == QOS1)
len = MQTTSerialize_ack(sendbuf, MAX_MQTT_PACKET_SIZE, PUBACK, 0, msg.id);
else if (msg.qos == QOS2)
len = MQTTSerialize_ack(sendbuf, MAX_MQTT_PACKET_SIZE, PUBREC, 0, msg.id);
if (len <= 0)
rc = FAILURE;
else
rc = sendPacket(len, timer);
if (rc == FAILURE)
goto exit; // there was a problem
}
break;
#endif
}
#if MQTTCLIENT_QOS2
case PUBREC:
case PUBREL:
unsigned short mypacketid;
unsigned char dup, type;
if (MQTTDeserialize_ack(&type, &dup, &mypacketid, readbuf, MAX_MQTT_PACKET_SIZE) != 1)
rc = FAILURE;
else if ((len = MQTTSerialize_ack(sendbuf, MAX_MQTT_PACKET_SIZE,
(packet_type == PUBREC) ? PUBREL : PUBCOMP, 0, mypacketid)) <= 0)
rc = FAILURE;
else if ((rc = sendPacket(len, timer)) != SUCCESS) // send the PUBREL packet
rc = FAILURE; // there was a problem
if (rc == FAILURE)
goto exit; // there was a problem
if (packet_type == PUBREL)
freeQoS2msgid(mypacketid);
break;
case PUBCOMP:
break;
#endif
case PINGRESP:
ping_outstanding = false;
break;
}
keepalive();
exit:
if (rc == SUCCESS)
rc = packet_type;
return rc;
}
template<class Network, class Timer, int MAX_MQTT_PACKET_SIZE, int b>
int MQTT::Client<Network, Timer, MAX_MQTT_PACKET_SIZE, b>::keepalive()
{
int rc = FAILURE;
if (keepAliveInterval == 0)
{
rc = SUCCESS;
goto exit;
}
if (last_sent.expired() || last_received.expired())
{
if (!ping_outstanding)
{
Timer timer = Timer(1000);
int len = MQTTSerialize_pingreq(sendbuf, MAX_MQTT_PACKET_SIZE);
if (len > 0 && (rc = sendPacket(len, timer)) == SUCCESS) // send the ping packet
ping_outstanding = true;
}
}
exit:
return rc;
}
// only used in single-threaded mode where one command at a time is in process
template<class Network, class Timer, int a, int b>
int MQTT::Client<Network, Timer, a, b>::waitfor(int packet_type, Timer& timer)
{
int rc = FAILURE;
do
{
if (timer.expired())
break; // we timed out
}
while ((rc = cycle(timer)) != packet_type);
return rc;
}
template<class Network, class Timer, int MAX_MQTT_PACKET_SIZE, int b>
int MQTT::Client<Network, Timer, MAX_MQTT_PACKET_SIZE, b>::connect(MQTTPacket_connectData& options)
{
Timer connect_timer = Timer(command_timeout_ms);
int rc = FAILURE;
int len = 0;
if (isconnected) // don't send connect packet again if we are already connected
goto exit;
this->keepAliveInterval = options.keepAliveInterval;
this->cleansession = options.cleansession;
if ((len = MQTTSerialize_connect(sendbuf, MAX_MQTT_PACKET_SIZE, &options)) <= 0)
goto exit;
if ((rc = sendPacket(len, connect_timer)) != SUCCESS) // send the connect packet
goto exit; // there was a problem
if (this->keepAliveInterval > 0)
last_received.countdown(this->keepAliveInterval);
// this will be a blocking call, wait for the connack
if (waitfor(CONNACK, connect_timer) == CONNACK)
{
unsigned char connack_rc = 255;
bool sessionPresent = false;
if (MQTTDeserialize_connack((unsigned char*)&sessionPresent, &connack_rc, readbuf, MAX_MQTT_PACKET_SIZE) == 1)
rc = connack_rc;
else
rc = FAILURE;
}
else
rc = FAILURE;
#if MQTTCLIENT_QOS2
// resend any inflight publish
if (inflightMsgid > 0 && inflightQoS == QOS2 && pubrel)
{
if ((len = MQTTSerialize_ack(sendbuf, MAX_MQTT_PACKET_SIZE, PUBREL, 0, inflightMsgid)) <= 0)
rc = FAILURE;
else
rc = publish(len, connect_timer, inflightQoS);
}
else
#endif
#if MQTTCLIENT_QOS1 || MQTTCLIENT_QOS2
if (inflightMsgid > 0)
{
memcpy(sendbuf, pubbuf, MAX_MQTT_PACKET_SIZE);
rc = publish(inflightLen, connect_timer, inflightQoS);
}
#endif
exit:
if (rc == SUCCESS)
isconnected = true;
return rc;
}
template<class Network, class Timer, int MAX_MQTT_PACKET_SIZE, int b>
int MQTT::Client<Network, Timer, MAX_MQTT_PACKET_SIZE, b>::connect()
{
MQTTPacket_connectData default_options = MQTTPacket_connectData_initializer;
return connect(default_options);
}
template<class Network, class Timer, int MAX_MQTT_PACKET_SIZE, int MAX_MESSAGE_HANDLERS>
int MQTT::Client<Network, Timer, MAX_MQTT_PACKET_SIZE, MAX_MESSAGE_HANDLERS>::subscribe(const char* topicFilter, enum QoS qos, messageHandler messageHandler)
{
int rc = FAILURE;
Timer timer = Timer(command_timeout_ms);
int len = 0;
MQTTString topic = {(char*)topicFilter, {0, 0}};
if (!isconnected)
goto exit;
len = MQTTSerialize_subscribe(sendbuf, MAX_MQTT_PACKET_SIZE, 0, packetid.getNext(), 1, &topic, (int*)&qos);
if (len <= 0)
goto exit;
if ((rc = sendPacket(len, timer)) != SUCCESS) // send the subscribe packet
goto exit; // there was a problem
if (waitfor(SUBACK, timer) == SUBACK) // wait for suback
{
int count = 0, grantedQoS = -1;
unsigned short mypacketid;
if (MQTTDeserialize_suback(&mypacketid, 1, &count, &grantedQoS, readbuf, MAX_MQTT_PACKET_SIZE) == 1)
rc = grantedQoS; // 0, 1, 2 or 0x80
if (rc != 0x80)
{
for (int i = 0; i < MAX_MESSAGE_HANDLERS; ++i)
{
if (messageHandlers[i].topicFilter == 0)
{
messageHandlers[i].topicFilter = topicFilter;
messageHandlers[i].fp.attach(messageHandler);
rc = 0;
break;
}
}
}
}
else
rc = FAILURE;
exit:
if (rc != SUCCESS)
cleanSession();
return rc;
}
template<class Network, class Timer, int MAX_MQTT_PACKET_SIZE, int MAX_MESSAGE_HANDLERS>
int MQTT::Client<Network, Timer, MAX_MQTT_PACKET_SIZE, MAX_MESSAGE_HANDLERS>::unsubscribe(const char* topicFilter)
{
int rc = FAILURE;
Timer timer = Timer(command_timeout_ms);
MQTTString topic = {(char*)topicFilter, {0, 0}};
int len = 0;
if (!isconnected)
goto exit;
if ((len = MQTTSerialize_unsubscribe(sendbuf, MAX_MQTT_PACKET_SIZE, 0, packetid.getNext(), 1, &topic)) <= 0)
goto exit;
if ((rc = sendPacket(len, timer)) != SUCCESS) // send the unsubscribe packet
goto exit; // there was a problem
if (waitfor(UNSUBACK, timer) == UNSUBACK)
{
unsigned short mypacketid; // should be the same as the packetid above
if (MQTTDeserialize_unsuback(&mypacketid, readbuf, MAX_MQTT_PACKET_SIZE) == 1)
{
rc = 0;
// remove the subscription message handler associated with this topic, if there is one
for (int i = 0; i < MAX_MESSAGE_HANDLERS; ++i)
{
if (strcmp(messageHandlers[i].topicFilter, topicFilter) == 0)
{
messageHandlers[i].topicFilter = 0;
break;
}
}
}
}
else
rc = FAILURE;
exit:
if (rc != SUCCESS)
cleanSession();
return rc;
}
template<class Network, class Timer, int MAX_MQTT_PACKET_SIZE, int b>
int MQTT::Client<Network, Timer, MAX_MQTT_PACKET_SIZE, b>::publish(int len, Timer& timer, enum QoS qos)
{
int rc;
if ((rc = sendPacket(len, timer)) != SUCCESS) // send the publish packet
goto exit; // there was a problem
#if MQTTCLIENT_QOS1
if (qos == QOS1)
{
if (waitfor(PUBACK, timer) == PUBACK)
{
unsigned short mypacketid;
unsigned char dup, type;
if (MQTTDeserialize_ack(&type, &dup, &mypacketid, readbuf, MAX_MQTT_PACKET_SIZE) != 1)
rc = FAILURE;
else if (inflightMsgid == mypacketid)
inflightMsgid = 0;
}
else
rc = FAILURE;
}
#elif MQTTCLIENT_QOS2
else if (qos == QOS2)
{
if (waitfor(PUBCOMP, timer) == PUBCOMP)
{
unsigned short mypacketid;
unsigned char dup, type;
if (MQTTDeserialize_ack(&type, &dup, &mypacketid, readbuf, MAX_MQTT_PACKET_SIZE) != 1)
rc = FAILURE;
else if (inflightMsgid == mypacketid)
inflightMsgid = 0;
}
else
rc = FAILURE;
}
#endif
exit:
if (rc != SUCCESS)
cleanSession();
return rc;
}
template<class Network, class Timer, int MAX_MQTT_PACKET_SIZE, int b>
int MQTT::Client<Network, Timer, MAX_MQTT_PACKET_SIZE, b>::publish(const char* topicName, void* payload, size_t payloadlen, unsigned short& id, enum QoS qos, bool retained)
{
int rc = FAILURE;
Timer timer = Timer(command_timeout_ms);
MQTTString topicString = MQTTString_initializer;
int len = 0;
if (!isconnected)
goto exit;
topicString.cstring = (char*)topicName;
#if MQTTCLIENT_QOS1 || MQTTCLIENT_QOS2
if (qos == QOS1 || qos == QOS2)
id = packetid.getNext();
#endif
len = MQTTSerialize_publish(sendbuf, MAX_MQTT_PACKET_SIZE, 0, qos, retained, id,
topicString, (unsigned char*)payload, payloadlen);
if (len <= 0)
goto exit;
#if MQTTCLIENT_QOS1 || MQTTCLIENT_QOS2
if (!cleansession)
{
memcpy(pubbuf, sendbuf, len);
inflightMsgid = id;
inflightLen = len;
inflightQoS = qos;
#if MQTTCLIENT_QOS2
pubrel = false;
#endif
}
#endif
rc = publish(len, timer, qos);
exit:
return rc;
}
template<class Network, class Timer, int MAX_MQTT_PACKET_SIZE, int b>
int MQTT::Client<Network, Timer, MAX_MQTT_PACKET_SIZE, b>::publish(const char* topicName, void* payload, size_t payloadlen, enum QoS qos, bool retained)
{
unsigned short id = 0; // dummy - not used for anything
return publish(topicName, payload, payloadlen, id, qos, retained);
}
template<class Network, class Timer, int MAX_MQTT_PACKET_SIZE, int b>
int MQTT::Client<Network, Timer, MAX_MQTT_PACKET_SIZE, b>::publish(const char* topicName, Message& message)
{
return publish(topicName, message.payload, message.payloadlen, message.qos, message.retained);
}
template<class Network, class Timer, int MAX_MQTT_PACKET_SIZE, int b>
int MQTT::Client<Network, Timer, MAX_MQTT_PACKET_SIZE, b>::disconnect()
{
int rc = FAILURE;
Timer timer = Timer(command_timeout_ms); // we might wait for incomplete incoming publishes to complete
int len = MQTTSerialize_disconnect(sendbuf, MAX_MQTT_PACKET_SIZE);
if (len > 0)
rc = sendPacket(len, timer); // send the disconnect packet
if (cleansession)
cleanSession();
else
isconnected = false;
return rc;
}
#endif
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