Alexandre Bernal
An API for using MQTT over multiple transports
Diff: MQTTClient.h
- Revision:
- 43:21da1f744243
- Parent:
- 42:f5beda831651
- Child:
- 44:c299463ae853
--- a/MQTTClient.h Thu Aug 21 12:40:43 2014 +0000
+++ b/MQTTClient.h Mon Sep 29 11:34:26 2014 +0000
@@ -13,14 +13,6 @@
* Contributors:
* Ian Craggs - initial API and implementation and/or initial documentation
*******************************************************************************/
-
- /*
-
- TODO:
-
- ensure publish packets are retried on reconnect
-
- */
#if !defined(MQTTCLIENT_H)
#define MQTTCLIENT_H
@@ -28,7 +20,14 @@
#include "FP.h"
#include "MQTTPacket.h"
#include "stdio.h"
-#include "MQTT_logging.h"
+#include "MQTTLogging.h"
+
+#if !defined(MQTTCLIENT_QOS1)
+ #define MQTTCLIENT_QOS1 1
+#endif
+#if !defined(MQTTCLIENT_QOS2)
+ #define MQTTCLIENT_QOS2 0
+#endif
namespace MQTT
{
@@ -55,7 +54,7 @@
{
MessageData(MQTTString &aTopicName, struct Message &aMessage) : message(aMessage), topicName(aTopicName)
{ }
-
+
struct Message &message;
MQTTString &topicName;
};
@@ -68,44 +67,33 @@
{
next = 0;
}
-
+
int getNext()
{
return next = (next == MAX_PACKET_ID) ? 1 : ++next;
}
-
+
private:
static const int MAX_PACKET_ID = 65535;
int next;
};
-class QoS2
-{
-public:
-
-
-private:
-
-
-};
-
-
/**
* @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.
+ * 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:
- */
+ * @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
@@ -113,8 +101,8 @@
* 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);
-
+ 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
*/
@@ -122,95 +110,135 @@
{
defaultMessageHandler.attach(mh);
}
-
- void setLogHandler()
- {
- logHandler.attach(lh);
- }
+ /** 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
+ * 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 = 0);
-
+ * @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);
-
+ * @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 -
- */
+ * @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 -
- */
+ * @return success code -
+ */
int unsubscribe(const char* topicFilter);
-
+
/** MQTT Disconnect - send an MQTT disconnect packet, and clean up any state
- * @return success code -
+ * @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
+ * 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(int timeout_ms = 1000);
-
+ int yield(unsigned long timeout_ms = 1000L);
+
+ /** Is the client connected?
+ * @return flag - is the client connected or not?
+ */
+ bool isConnected()
+ {
+ return isconnected;
+ }
+
private:
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 int command_timeout_ms;
-
- unsigned char buf[MAX_MQTT_PACKET_SIZE];
- unsigned char readbuf[MAX_MQTT_PACKET_SIZE];
+ unsigned long command_timeout_ms;
- Timer ping_timer;
+ 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 0
- struct
- {
- bool used;
- int id;
- } QoS2messages[MAX_QOS2_MESSAGES];
-
+
+#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);
#endif
};
@@ -218,45 +246,90 @@
}
-template<class Network, class Timer, int a, int MAX_MESSAGE_HANDLERS>
+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()
{
- ping_timer = Timer();
- ping_outstanding = 0;
+ last_sent = Timer();
+ last_received = Timer();
+ ping_outstanding = false;
for (int i = 0; i < MAX_MESSAGE_HANDLERS; ++i)
messageHandlers[i].topicFilter = 0;
- this->command_timeout_ms = command_timeout_ms;
+ this->command_timeout_ms = command_timeout_ms;
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
+}
+
+#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>
+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;
+}
+#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,
+ int rc = FAILURE,
sent = 0;
-
+
while (sent < length && !timer.expired())
{
- rc = ipstack.write(&buf[sent], length, timer.left_ms());
+ rc = ipstack.write(&sendbuf[sent], length, timer.left_ms());
if (rc < 0) // there was an error writing the data
break;
sent += rc;
}
if (sent == length)
{
- ping_timer.countdown(this->keepAliveInterval); // record the fact that we have successfully sent the packet
+ if (this->keepAliveInterval > 0)
+ last_sent.countdown(this->keepAliveInterval); // record the fact that we have successfully sent the packet
rc = SUCCESS;
- //if (debug)
- // Log (packet)
}
else
rc = FAILURE;
+
+#if defined(MQTT_DEBUG)
+ char printbuf[50];
+ DEBUG("Rc %d from sending packet %s\n", rc, MQTTPacket_toString(printbuf, sizeof(printbuf), sendbuf, length));
+#endif
return rc;
}
-template<class Network, class Timer, int a, int b>
+template<class Network, class Timer, int a, int b>
int MQTT::Client<Network, Timer, a, b>::decodePacket(int* value, int timeout)
{
unsigned char c;
@@ -287,12 +360,12 @@
/**
* If any read fails in this method, then we should disconnect from the network, as on reconnect
- * the packets can be retried.
+ * 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 a, int b>
-int MQTT::Client<Network, Timer, a, b>::readPacket(Timer& timer)
+template<class Network, class Timer, int a, int b>
+int MQTT::Client<Network, Timer, a, b>::readPacket(Timer& timer)
{
int rc = FAILURE;
MQTTHeader header = {0};
@@ -306,15 +379,22 @@
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 back into the buffer */
+ len += MQTTPacket_encode(readbuf + 1, rem_len); /* put the original remaining length into the buffer */
/* 3. read the rest of the buffer using a callback to supply the rest of the data */
- if (ipstack.read(readbuf + len, rem_len, timer.left_ms()) != rem_len)
+ 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)
+ char printbuf[50];
+ DEBUG("Rc %d from receiving packet %s\n", rc, MQTTPacket_toString(printbuf, sizeof(printbuf), readbuf, len));
+#endif
return rc;
}
@@ -322,13 +402,13 @@
// 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>
+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 != '/')
@@ -346,13 +426,13 @@
curf++;
curn++;
};
-
+
return (curn == curn_end) && (*curf == '\0');
}
-template<class Network, class Timer, int a, int MAX_MESSAGE_HANDLERS>
+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;
@@ -371,25 +451,25 @@
}
}
}
-
- if (rc == FAILURE && defaultMessageHandler.attached())
+
+ 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(int timeout_ms)
+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())
{
@@ -399,19 +479,19 @@
break;
}
}
-
+
return rc;
}
-template<class Network, class Timer, int MAX_MQTT_PACKET_SIZE, int b>
+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
unsigned short packet_type = readPacket(timer);
-
+
int len = 0,
rc = SUCCESS;
@@ -427,21 +507,26 @@
if (MQTTDeserialize_publish((unsigned char*)&msg.dup, (int*)&msg.qos, (unsigned char*)&msg.retained, (unsigned short*)&msg.id, &topicName,
(unsigned char**)&msg.payload, (int*)&msg.payloadlen, readbuf, MAX_MQTT_PACKET_SIZE) != 1)
goto exit;
-// if (msg.qos != QOS2)
+#if MQTTCLIENT_QOS2
+ if (msg.qos != QOS2)
+#endif
deliverMessage(topicName, msg);
-#if 0
+#if MQTTCLIENT_QOS2
else if (isQoS2msgidFree(msg.id))
{
- UseQoS2msgid(msg.id);
- deliverMessage(topicName, msg);
- }
+ 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(buf, MAX_MQTT_PACKET_SIZE, PUBACK, 0, msg.id);
+ len = MQTTSerialize_ack(sendbuf, MAX_MQTT_PACKET_SIZE, PUBACK, 0, msg.id);
else if (msg.qos == QOS2)
- len = MQTTSerialize_ack(buf, MAX_MQTT_PACKET_SIZE, PUBREC, 0, msg.id);
+ len = MQTTSerialize_ack(sendbuf, MAX_MQTT_PACKET_SIZE, PUBREC, 0, msg.id);
if (len <= 0)
rc = FAILURE;
else
@@ -450,12 +535,14 @@
goto exit; // there was a problem
}
break;
+#endif
+#if MQTTCLIENT_QOS2
case PUBREC:
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(buf, MAX_MQTT_PACKET_SIZE, PUBREL, 0, mypacketid)) <= 0)
+ else if ((len = MQTTSerialize_ack(sendbuf, MAX_MQTT_PACKET_SIZE, PUBREL, 0, mypacketid)) <= 0)
rc = FAILURE;
else if ((rc = sendPacket(len, timer)) != SUCCESS) // send the PUBREL packet
rc = FAILURE; // there was a problem
@@ -464,6 +551,7 @@
break;
case PUBCOMP:
break;
+#endif
case PINGRESP:
ping_outstanding = false;
break;
@@ -487,12 +575,12 @@
goto exit;
}
- if (ping_timer.expired())
+ if (last_sent.expired() || last_received.expired())
{
if (!ping_outstanding)
{
Timer timer = Timer(1000);
- int len = MQTTSerialize_pingreq(buf, MAX_MQTT_PACKET_SIZE);
+ int len = MQTTSerialize_pingreq(sendbuf, MAX_MQTT_PACKET_SIZE);
if (len > 0 && (rc = sendPacket(len, timer)) == SUCCESS) // send the ping packet
ping_outstanding = true;
}
@@ -504,43 +592,41 @@
// only used in single-threaded mode where one command at a time is in process
-template<class Network, class Timer, int a, int b>
+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())
+ if (timer.expired())
break; // we timed out
}
- while ((rc = cycle(timer)) != packet_type);
-
+ 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)
+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;
- MQTTPacket_connectData default_options = MQTTPacket_connectData_initializer;
int len = 0;
-
+
if (isconnected) // don't send connect packet again if we are already connected
goto exit;
- if (options == 0)
- options = &default_options; // set default options if none were supplied
-
- this->keepAliveInterval = options->keepAliveInterval;
- ping_timer.countdown(this->keepAliveInterval);
- if ((len = MQTTSerialize_connect(buf, MAX_MQTT_PACKET_SIZE, options)) <= 0)
+ 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)
{
@@ -553,7 +639,26 @@
}
else
rc = FAILURE;
-
+
+#if MQTTCLIENT_QOS2
+ // resend an 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;
@@ -561,29 +666,37 @@
}
-template<class Network, class Timer, int MAX_MQTT_PACKET_SIZE, int MAX_MESSAGE_HANDLERS>
+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;
+{
+ 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(buf, MAX_MQTT_PACKET_SIZE, 0, packetid.getNext(), 1, &topic, (int*)&qos);
+
+ 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
+
+ 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
+ rc = grantedQoS; // 0, 1, 2 or 0x80
if (rc != 0x80)
{
for (int i = 0; i < MAX_MESSAGE_HANDLERS; ++i)
@@ -598,67 +711,58 @@
}
}
}
- else
+ else
rc = FAILURE;
-
+
exit:
+ if (rc != SUCCESS)
+ isconnected = false;
return rc;
}
-template<class Network, class Timer, int MAX_MQTT_PACKET_SIZE, int MAX_MESSAGE_HANDLERS>
+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);
+ Timer timer = Timer(command_timeout_ms);
MQTTString topic = {(char*)topicFilter, 0, 0};
int len = 0;
-
+
if (!isconnected)
goto exit;
-
- if ((len = MQTTSerialize_unsubscribe(buf, MAX_MQTT_PACKET_SIZE, 0, packetid.getNext(), 1, &topic)) <= 0)
+
+ 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 subscribe packet
+ 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;
+ rc = 0;
}
else
rc = FAILURE;
-
+
exit:
+ if (rc != SUCCESS)
+ isconnected = false;
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, Message* message)
+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 = FAILURE;
- Timer timer = Timer(command_timeout_ms);
- MQTTString topicString = {(char*)topicName, 0, 0};
- int len = 0;
+ int rc;
- if (!isconnected)
- goto exit;
+ if ((rc = sendPacket(len, timer)) != SUCCESS) // send the publish packet
+ goto exit; // there was a problem
- if (message->qos == QOS1 || message->qos == QOS2)
- message->id = packetid.getNext();
-
- len = MQTTSerialize_publish(buf, MAX_MQTT_PACKET_SIZE, 0, message->qos, message->retained, message->id,
- topicString, (unsigned char*)message->payload, message->payloadlen);
- if (len <= 0)
- goto exit;
- if ((rc = sendPacket(len, timer)) != SUCCESS) // send the subscribe packet
- goto exit; // there was a problem
-
- if (message->qos == QOS1)
+#if MQTTCLIENT_QOS1
+ if (qos == QOS1)
{
if (waitfor(PUBACK, timer) == PUBACK)
{
@@ -666,11 +770,14 @@
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;
}
- else if (message->qos == QOS2)
+#elif MQTTCLIENT_QOS2
+ else if (qos == QOS2)
{
if (waitfor(PUBCOMP, timer) == PUBCOMP)
{
@@ -678,28 +785,91 @@
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)
+ isconnected = false;
+ 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>
+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(buf, MAX_MQTT_PACKET_SIZE);
if (len > 0)
rc = sendPacket(len, timer); // send the disconnect packet
-
+
isconnected = false;
return rc;
}
-#endif
\ No newline at end of file
+#endif