Example of AWS IoT connection and Web Dashboard thru STM32 Nucleo evaluation board and mbed OS.
Dependencies: X_NUCLEO_IKS01A1 mbed FP MQTTPacket DnsQuery ATParser
Introduction
The demo is aimed to STM32 Nucleo board with WiFi and sensors expansions. The board is a "thing" for the AWS IoT service. It updates IoT service shadow with sensors data every second and checks subscription messages.
Hardware Configuration
- NUCLEO-F401RE - Nucleo Development Board
- X-NUCLEO-IDW01M1 - Wi-Fi expansion board for STM32 Nucleo
- X-NUCLEO-IKS01A1 - Motion MEMS and environmental sensor expansion board for STM32 Nucleo
Software Configuration
- Import this Project to mbed online compiler
- Find the next part of code in main.cpp file ...
WiFi network credential
#include "mbed.h" // WiFi network credential #define SSID "" // Network must be visible otherwise it can't connect #define PASSW "" #error "Wifi SSID & password empty"
- ... And set it to your Network Name and Password. Do not forget to remove "#error" pragma line.
Information
Nucleo WiFi module is not the same as your smartphone or laptope - it is based on demo board. To avoid connection problems:
- Place Nucleo as close to WiFi hot spot as possible. Or...
- Turn on mobile hot spot in your laptop as close to the device as possible.
- Make sure that hot spot permits 2.4 GHz band communications
- Setup BackEnd and store certificates using this backend setup instruction
- Find AWS_IOT_MQTT_HOST define and change it to HTTPS point mentioned in your AWS IoT thing properties named "interact"
#define AWS_IOT_MQTT_HOST "xxxxxxxxxx.iot.us-east-1.amazonaws.com" //Use your own host.
- Find the certificate defines clientCRT and clientKey in main.cpp file and change it to ones provided by Amazon.
/********************************************************************************************** *********************************************************************************************** Device Identity Certificates: Modify for your AWS IoT Thing *********************************************************************************************** ***********************************************************************************************/ /**************************************** (somecode)-certificate.pem.crt - Amazon signed PEM sertificate. *****************************************/ //This Client cert is example. Use own instead. const uint8_t clientCRT[] = "\ -----BEGIN CERTIFICATE-----\n\ MIIDBjCCAe6gAwIBAgIUVph856omeIxW3UPioq+UrX1DbwowDQYJKoZIhvcNAQEL\ BQAwTTFLMEkGA1UECwxCQW1hem9uIFdlYiBTZXJ2aWNlcyBPPUFtYXpvbi5jb20g\ SW5jLiBMPVNlYXR0bGUgU1Q9V2FzaGluZ3RvbiBDPVVTMB4XDTE3MDUyNTExNTEy\ OVoXDTQ5MTIzMTIzNTk1OVowgZUxCzAJBgNVBAYTAkJZMQ4wDAYDVQQIDAVNaW5z\ azEOMAwGA1UEBwwFTWluc2sxFzAVBgNVBAoMDktsaWthLVRlY2ggTExDMRcwFQYD\ VQQLDA5LbGlrYS1UZWNoIExMQzEMMAoGA1UEAwwDUm5EMSYwJAYJKoZIhvcNAQkB\ FhdtdmF0YWxldUBrbGlrYS10ZWNoLmNvbTBZMBMGByqGSM49AgEGCCqGSM49AwEH\ A0IABCJgOQJmoTBJVPfli9Hm/JVixaxkY5rtlgrYO3hSl633A2hg0P/ue0wXDbF3\ aQ0X57IRFE4k4FEbr3UXjT/IczKjYDBeMB8GA1UdIwQYMBaAFK3YzTUPlYB2Li75\ i/z8rEogr1d6MB0GA1UdDgQWBBT18HXBaXFJuAR/0SwegnxJ+pyJ6TAMBgNVHRMB\ Af8EAjAAMA4GA1UdDwEB/wQEAwIHgDANBgkqhkiG9w0BAQsFAAOCAQEAb0Ux1aH5\ RLxjrfGqXN6rPVqh8QQRS+AyBfzmaQN8HaPZMkX5WxXLvcn0A3uWlwQxPPkcZ4zf\ 51GHtFFQWB4YZ8dx8mUQ0v/j7onHjCJgZ8iDgwOyKMGtnsDZWCakQw+a6cj+NrMZ\ tzhjwCzEEP6ePcbXwErI5OOzLuWns2L/JEr2wWNkokgRuS8ewr/SQ9OLWIWa2rFM\ ahPNTb3y/qBeWdjeJmhI+TOxdqIpsF8roWP25zwo/zkzCHCjXFBrL+0CA4MpxIl9\ x02i7aAhlJ6ys80lDxdeWeeQJXRKkGknP8mcmKn3iEqqJ5s1dQePj2b5d3ldatya\ wsxQBqqZXzIWEw==\ \n\ -----END CERTIFICATE-----\n"; /********************************************************************************************** *********************************************************************************************** Private Key: Modify for your AWS IoT Thing *********************************************************************************************** ***********************************************************************************************/ /********************************************************************8**************************************** nucleo.key.pem - client key generated according to readme. **************************************************************************************************************/ //This Client Key is example. Use own instead. const uint8_t clientKey[] ="\ -----BEGIN EC PARAMETERS-----\n\ BggqhkjOPQMBBw==\ -----END EC PARAMETERS-----\n\ -----BEGIN EC PRIVATE KEY-----\n\ MHcCAQEEIHPRfWSC8/k/BsqDWKuP15dXsI9fGwpkTIsLZe6mIrAAoAoGCCqGSM49\ AwEHoUQDQgAEImA5AmahMElU9+WL0eb8lWLFrGRjmu2WCtg7eFKXrfcDaGDQ/+57\ TBcNsXdpDRfnshEUTiTgURuvdReNP8hzMg==\ -----END EC PRIVATE KEY-----\n";
Build and Check
- Plugin your board to USB of your PC. USB Disk Drive and USB COM Port should appear in your system.
- Open any Serial Console, connect it to your USB Serial Port and setup speed equal to 115200.
- Compile this Project and save .bin file to USB Disk Drive
- After board reset you should see next log in serial console:
X-NUCLEO-IDW01M1 mbed Application connecting to AP LOG: int main() L#361 Connected to WiFI. LOG: int connect(MQTT::Client<MQTTWiFi, Countdown, 350, 5> *, MQTTWiFi *) L#186 ===================================== LOG: int connect(MQTT::Client<MQTTWiFi, Countdown, 350, 5> *, MQTTWiFi *) L#187 Connecting WiFi. LOG: int connect(MQTT::Client<MQTTWiFi, Countdown, 350, 5> *, MQTTWiFi *) L#188 Nucleo IP ADDRESS: X.X.X.X LOG: int connect(MQTT::Client<MQTTWiFi, Countdown, 350, 5> *, MQTTWiFi *) L#189 Nucleo MAC ADDRESS: 00:11:22:33:44:55 LOG: int connect(MQTT::Client<MQTTWiFi, Countdown, 350, 5> *, MQTTWiFi *) L#190 Server Hostname: xxxxxxxx.iot.us-east-1.amazonaws.com port: 8883 LOG: int connect(MQTT::Client<MQTTWiFi, Countdown, 350, 5> *, MQTTWiFi *) L#191 Client ID: Nucleo LOG: int connect(MQTT::Client<MQTTWiFi, Countdown, 350, 5> *, MQTTWiFi *) L#194 ===================================== LOG: int MQTTSocket::getNTPtime(int) L#58 Success receiving time from ntp server. Tick from 1 Jan 1970 is equal to 1505399292. --->TCP Connected --->MQTT Connected --->>>MQTT subscribed to: Nucleo/test Length - 245, Publishing {"state": {"reported": {"temperature": 23.690001, "humidity": 98.190002, "pressure": 982.869141, "accelerometer": [-0.009000, 0.030000, 0.971000], "gyroscope": [0.420000, -2.660000, 1.750000], "magnetometer": [-3.600000, -7.100000, 53.300000]}}} Length - 245, Publishing {"state": {"reported": {"temperature": 23.660000, "humidity": 98.010002, "pressure": 982.770264, "accelerometer": [-0.009000, 0.030000, 0.971000], "gyroscope": [0.770000, -2.310000, 1.470000], "magnetometer": [-3.100000, -8.300000, 54.200000]}}} Length - 245, Publishing {"state": {"reported": {"temperature": 23.670000, "humidity": 98.129997, "pressure": 982.724121, "accelerometer": [-0.008000, 0.029000, 0.971000], "gyroscope": [0.630000, -2.380000, 1.400000], "magnetometer": [-3.100000, -7.900000, 53.400000]}}} Length - 245, Publishing {"state": {"reported": {"temperature": 23.690001, "humidity": 98.019997, "pressure": 982.840088, "accelerometer": [-0.009000, 0.030000, 0.972000], "gyroscope": [0.700000, -2.450000, 1.540000], "magnetometer": [-3.700000, -7.900000, 53.400000]}}} Length - 245, Publishing {"state": {"reported": {"temperature": 23.709999, "humidity": 98.040001, "pressure": 982.828613, "accelerometer": [-0.009000, 0.030000, 0.971000], "gyroscope": [0.630000, -2.520000, 1.470000], "magnetometer": [-2.900000, -7.400000, 52.400000]}}} Length - 245, Publishing {"state": {"reported": {"temperature": 23.719999, "humidity": 97.860001, "pressure": 982.917236, "accelerometer": [-0.026000, 0.103000, 0.891000], "gyroscope": [1.050000, -2.310000, 1.260000], "magnetometer": [-3.300000, -7.100000, 53.500000]}}}
Information
Device connection state might be checked by Green Led on the board. Green light means that device is connected and transferring data to cloud.
- Configure and start your dashboard using instruction and corresponding sources from github
- Use Blue button to set up markers to charts.
- Use AWS IoT console MQTT Client to test device subscription to "Nucleo/test". Just publish any message to this topic and serial port output.
- PROFIT!
MQTT/MQTTAsync.h
- Committer:
- PavelSavyhin
- Date:
- 2017-10-19
- Revision:
- 1:042ca9148926
- Parent:
- 0:4cdaf9b1e7d0
File content as of revision 1:042ca9148926:
/******************************************************************************* * Copyright (c) 2014 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 *******************************************************************************/ #if !defined(MQTTASYNC_H) #define MQTTASYNC_H #include "FP.h" #include "MQTTPacket.h" #include "stdio.h" namespace MQTT { enum QoS { QOS0, QOS1, QOS2 }; struct Message { enum QoS qos; bool retained; bool dup; unsigned short id; void *payload; size_t payloadlen; }; class PacketId { public: PacketId(); int getNext(); private: static const int MAX_PACKET_ID = 65535; int next; }; typedef void (*messageHandler)(Message*); typedef struct limits { int MAX_MQTT_PACKET_SIZE; // int MAX_MESSAGE_HANDLERS; // each subscription requires a message handler int MAX_CONCURRENT_OPERATIONS; // each command which runs concurrently can have a result handler, when we are in multi-threaded mode int command_timeout_ms; limits() { MAX_MQTT_PACKET_SIZE = 100; MAX_MESSAGE_HANDLERS = 5; MAX_CONCURRENT_OPERATIONS = 1; // 1 indicates single-threaded mode - set to >1 for multithreaded mode command_timeout_ms = 30000; } } Limits; /** * @class Async * @brief non-blocking, threaded MQTT client API * @param Network a network class which supports send, receive * @param Timer a timer class with the methods: */ template<class Network, class Timer, class Thread, class Mutex> class Async { public: struct Result { /* success or failure result data */ Async<Network, Timer, Thread, Mutex>* client; int rc; }; typedef void (*resultHandler)(Result*); Async(Network* network, const Limits limits = Limits()); typedef struct { Async* client; Network* network; } connectionLostInfo; typedef int (*connectionLostHandlers)(connectionLostInfo*); /** Set the connection lost callback - called whenever the connection is lost and we should be connected * @param clh - pointer to the callback function */ void setConnectionLostHandler(connectionLostHandlers clh) { connectionLostHandler.attach(clh); } /** 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); } int connect(resultHandler fn, MQTTPacket_connectData* options = 0); template<class T> int connect(void(T::*method)(Result *), MQTTPacket_connectData* options = 0, T *item = 0); // alternative to pass in pointer to member function int publish(resultHandler rh, const char* topic, Message* message); int subscribe(resultHandler rh, const char* topicFilter, enum QoS qos, messageHandler mh); int unsubscribe(resultHandler rh, const char* topicFilter); int disconnect(resultHandler rh); private: void run(void const *argument); int cycle(int timeout); int waitfor(int packet_type, Timer& atimer); int keepalive(); int findFreeOperation(); int decodePacket(int* value, int timeout); int readPacket(int timeout); int sendPacket(int length, int timeout); int deliverMessage(MQTTString* topic, Message* message); Thread* thread; Network* ipstack; Limits limits; char* buf; char* readbuf; Timer ping_timer, connect_timer; unsigned int keepAliveInterval; bool ping_outstanding; PacketId packetid; typedef FP<void, Result*> resultHandlerFP; resultHandlerFP connectHandler; typedef FP<void, Message*> messageHandlerFP; struct MessageHandlers { const char* topic; messageHandlerFP fp; } *messageHandlers; // Message handlers are indexed by subscription topic // how many concurrent operations should we allow? Each one will require a function pointer struct Operations { unsigned short id; resultHandlerFP fp; const char* topic; // if this is a publish, store topic name in case republishing is required Message* message; // for publish, Timer timer; // to check if the command has timed out } *operations; // result handlers are indexed by packet ids static void threadfn(void* arg); messageHandlerFP defaultMessageHandler; typedef FP<int, connectionLostInfo*> connectionLostFP; connectionLostFP connectionLostHandler; }; } template<class Network, class Timer, class Thread, class Mutex> void MQTT::Async<Network, Timer, Thread, Mutex>::threadfn(void* arg) { ((Async<Network, Timer, Thread, Mutex>*) arg)->run(NULL); } template<class Network, class Timer, class Thread, class Mutex> MQTT::Async<Network, Timer, Thread, Mutex>::Async(Network* network, Limits limits) : limits(limits), packetid() { this->thread = 0; this->ipstack = network; this->ping_timer = Timer(); this->ping_outstanding = 0; // How to make these memory allocations portable? I was hoping to avoid the heap buf = new char[limits.MAX_MQTT_PACKET_SIZE]; readbuf = new char[limits.MAX_MQTT_PACKET_SIZE]; this->operations = new struct Operations[limits.MAX_CONCURRENT_OPERATIONS]; for (int i = 0; i < limits.MAX_CONCURRENT_OPERATIONS; ++i) operations[i].id = 0; this->messageHandlers = new struct MessageHandlers[limits.MAX_MESSAGE_HANDLERS]; for (int i = 0; i < limits.MAX_MESSAGE_HANDLERS; ++i) messageHandlers[i].topic = 0; } template<class Network, class Timer, class Thread, class Mutex> int MQTT::Async<Network, Timer, Thread, Mutex>::sendPacket(int length, int timeout) { int sent = 0; while (sent < length) sent += ipstack->write(&buf[sent], length, timeout); if (sent == length) ping_timer.countdown(this->keepAliveInterval); // record the fact that we have successfully sent the packet return sent; } template<class Network, class Timer, class Thread, class Mutex> int MQTT::Async<Network, Timer, Thread, Mutex>::decodePacket(int* value, int timeout) { 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, class Thread, class Mutex> int MQTT::Async<Network, Timer, Thread, Mutex>::readPacket(int timeout) { int rc = -1; 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, timeout) != 1) goto exit; len = 1; /* 2. read the remaining length. This is variable in itself */ decodePacket(&rem_len, timeout); len += MQTTPacket_encode(readbuf + 1, rem_len); /* put the original remaining length back 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, timeout) != rem_len) goto exit; header.byte = readbuf[0]; rc = header.bits.type; exit: return rc; } template<class Network, class Timer, class Thread, class Mutex> int MQTT::Async<Network, Timer, Thread, Mutex>::deliverMessage(MQTTString* topic, Message* message) { int rc = -1; // we have to find the right message handler - indexed by topic for (int i = 0; i < limits.MAX_MESSAGE_HANDLERS; ++i) { if (messageHandlers[i].topic != 0 && MQTTPacket_equals(topic, (char*)messageHandlers[i].topic)) { messageHandlers[i].fp(message); rc = 0; break; } } return rc; } template<class Network, class Timer, class Thread, class Mutex> int MQTT::Async<Network, Timer, Thread, Mutex>::cycle(int timeout) { /* get one piece of work off the wire and one pass through */ // read the socket, see what work is due int packet_type = readPacket(timeout); int len, rc; switch (packet_type) { case CONNACK: if (this->thread) { Result res = {this, 0}; if (MQTTDeserialize_connack(&res.rc, readbuf, limits.MAX_MQTT_PACKET_SIZE) == 1) ; connectHandler(&res); connectHandler.detach(); // only invoke the callback once } break; case PUBACK: if (this->thread) ; //call resultHandler case SUBACK: break; case PUBLISH: MQTTString topicName; Message msg; rc = MQTTDeserialize_publish((int*)&msg.dup, (int*)&msg.qos, (int*)&msg.retained, (int*)&msg.id, &topicName, (char**)&msg.payload, (int*)&msg.payloadlen, readbuf, limits.MAX_MQTT_PACKET_SIZE);; if (msg.qos == QOS0) deliverMessage(&topicName, &msg); break; case PUBREC: int type, dup, mypacketid; if (MQTTDeserialize_ack(&type, &dup, &mypacketid, readbuf, limits.MAX_MQTT_PACKET_SIZE) == 1) ; // must lock this access against the application thread, if we are multi-threaded len = MQTTSerialize_ack(buf, limits.MAX_MQTT_PACKET_SIZE, PUBREL, 0, mypacketid); rc = sendPacket(len, timeout); // send the PUBREL packet if (rc != len) goto exit; // there was a problem break; case PUBCOMP: break; case PINGRESP: ping_outstanding = false; break; } keepalive(); exit: return packet_type; } template<class Network, class Timer, class Thread, class Mutex> int MQTT::Async<Network, Timer, Thread, Mutex>::keepalive() { int rc = 0; if (keepAliveInterval == 0) goto exit; if (ping_timer.expired()) { if (ping_outstanding) rc = -1; else { int len = MQTTSerialize_pingreq(buf, limits.MAX_MQTT_PACKET_SIZE); rc = sendPacket(len, 1000); // send the ping packet if (rc != len) rc = -1; // indicate there's a problem else ping_outstanding = true; } } exit: return rc; } template<class Network, class Timer, class Thread, class Mutex> void MQTT::Async<Network, Timer, Thread, Mutex>::run(void const *argument) { while (true) cycle(ping_timer.left_ms()); } // only used in single-threaded mode where one command at a time is in process template<class Network, class Timer, class Thread, class Mutex> int MQTT::Async<Network, Timer, Thread, Mutex>::waitfor(int packet_type, Timer& atimer) { int rc = -1; do { if (atimer.expired()) break; // we timed out } while ((rc = cycle(atimer.left_ms())) != packet_type); return rc; } template<class Network, class Timer, class Thread, class Mutex> int MQTT::Async<Network, Timer, Thread, Mutex>::connect(resultHandler resultHandler, MQTTPacket_connectData* options) { connect_timer.countdown(limits.command_timeout_ms); MQTTPacket_connectData default_options = MQTTPacket_connectData_initializer; if (options == 0) options = &default_options; // set default options if none were supplied this->keepAliveInterval = options->keepAliveInterval; ping_timer.countdown(this->keepAliveInterval); int len = MQTTSerialize_connect(buf, limits.MAX_MQTT_PACKET_SIZE, options); int rc = sendPacket(len, connect_timer.left_ms()); // send the connect packet if (rc != len) goto exit; // there was a problem if (resultHandler == 0) // wait until the connack is received { // this will be a blocking call, wait for the connack if (waitfor(CONNACK, connect_timer) == CONNACK) { int connack_rc = -1; if (MQTTDeserialize_connack(&connack_rc, readbuf, limits.MAX_MQTT_PACKET_SIZE) == 1) rc = connack_rc; } } else { // set connect response callback function connectHandler.attach(resultHandler); // start background thread this->thread = new Thread((void (*)(void const *argument))&MQTT::Async<Network, Timer, Thread, Mutex>::threadfn, (void*)this); } exit: return rc; } template<class Network, class Timer, class Thread, class Mutex> int MQTT::Async<Network, Timer, Thread, Mutex>::findFreeOperation() { int found = -1; for (int i = 0; i < limits.MAX_CONCURRENT_OPERATIONS; ++i) { if (operations[i].id == 0) { found = i; break; } } return found; } template<class Network, class Timer, class Thread, class Mutex> int MQTT::Async<Network, Timer, Thread, Mutex>::subscribe(resultHandler resultHandler, const char* topicFilter, enum QoS qos, messageHandler messageHandler) { int index = 0; if (this->thread) index = findFreeOperation(); Timer& atimer = operations[index].timer; atimer.countdown(limits.command_timeout_ms); MQTTString topic = {(char*)topicFilter, 0, 0}; int len = MQTTSerialize_subscribe(buf, limits.MAX_MQTT_PACKET_SIZE, 0, packetid.getNext(), 1, &topic, (int*)&qos); int rc = sendPacket(len, atimer.left_ms()); // send the subscribe packet if (rc != len) goto exit; // there was a problem /* wait for suback */ if (resultHandler == 0) { // this will block if (waitfor(SUBACK, atimer) == SUBACK) { int count = 0, grantedQoS = -1, mypacketid; if (MQTTDeserialize_suback(&mypacketid, 1, &count, &grantedQoS, readbuf, limits.MAX_MQTT_PACKET_SIZE) == 1) rc = grantedQoS; // 0, 1, 2 or 0x80 if (rc != 0x80) { for (int i = 0; i < limits.MAX_MESSAGE_HANDLERS; ++i) { if (messageHandlers[i].topic == 0) { messageHandlers[i].topic = topicFilter; messageHandlers[i].fp.attach(messageHandler); rc = 0; break; } } } } } else { // set subscribe response callback function } exit: return rc; } template<class Network, class Timer, class Thread, class Mutex> int MQTT::Async<Network, Timer, Thread, Mutex>::unsubscribe(resultHandler resultHandler, const char* topicFilter) { int index = 0; if (this->thread) index = findFreeOperation(); Timer& atimer = operations[index].timer; atimer.countdown(limits.command_timeout_ms); MQTTString topic = {(char*)topicFilter, 0, 0}; int len = MQTTSerialize_unsubscribe(buf, limits.MAX_MQTT_PACKET_SIZE, 0, packetid.getNext(), 1, &topic); int rc = sendPacket(len, atimer.left_ms()); // send the subscribe packet if (rc != len) goto exit; // there was a problem // set unsubscribe response callback function exit: return rc; } template<class Network, class Timer, class Thread, class Mutex> int MQTT::Async<Network, Timer, Thread, Mutex>::publish(resultHandler resultHandler, const char* topicName, Message* message) { int index = 0; if (this->thread) index = findFreeOperation(); Timer& atimer = operations[index].timer; atimer.countdown(limits.command_timeout_ms); MQTTString topic = {(char*)topicName, 0, 0}; if (message->qos == QOS1 || message->qos == QOS2) message->id = packetid.getNext(); int len = MQTTSerialize_publish(buf, limits.MAX_MQTT_PACKET_SIZE, 0, message->qos, message->retained, message->id, topic, (char*)message->payload, message->payloadlen); int rc = sendPacket(len, atimer.left_ms()); // send the subscribe packet if (rc != len) goto exit; // there was a problem /* wait for acks */ if (resultHandler == 0) { if (message->qos == QOS1) { if (waitfor(PUBACK, atimer) == PUBACK) { int type, dup, mypacketid; if (MQTTDeserialize_ack(&type, &dup, &mypacketid, readbuf, limits.MAX_MQTT_PACKET_SIZE) == 1) rc = 0; } } else if (message->qos == QOS2) { if (waitfor(PUBCOMP, atimer) == PUBCOMP) { int type, dup, mypacketid; if (MQTTDeserialize_ack(&type, &dup, &mypacketid, readbuf, limits.MAX_MQTT_PACKET_SIZE) == 1) rc = 0; } } } else { // set publish response callback function } exit: return rc; } template<class Network, class Timer, class Thread, class Mutex> int MQTT::Async<Network, Timer, Thread, Mutex>::disconnect(resultHandler resultHandler) { Timer timer = Timer(limits.command_timeout_ms); // we might wait for incomplete incoming publishes to complete int len = MQTTSerialize_disconnect(buf, limits.MAX_MQTT_PACKET_SIZE); int rc = sendPacket(len, timer.left_ms()); // send the disconnect packet return (rc == len) ? 0 : -1; } #endif