最新最容易的MQTT客户端C语言代码(Paho库及二次封装)

/******************************************************************************* * Copyright (c) 2009, 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 * Ian Craggs - bug 384016 - segv setting will message * Ian Craggs - bug 384053 - v1.0.0.7 - stop MQTTClient_receive on socket error * Ian Craggs, Allan Stockdill-Mander - add ability to connect with SSL * Ian Craggs - multiple server connection support * Ian Craggs - fix for bug 413429 - connectionLost not called * Ian Craggs - fix for bug 421103 - trying to write to same socket, in publish/retries * Ian Craggs - fix for bug 419233 - mutexes not reporting errors * Ian Craggs - fix for bug 420851 * Ian Craggs - fix for bug 432903 - queue persistence * Ian Craggs - MQTT 3.1.1 support * Ian Craggs - fix for bug 438176 - MQTT version selection * Rong Xiang, Ian Craggs - C++ compatibility * Ian Craggs - fix for bug 443724 - stack corruption * Ian Craggs - fix for bug 447672 - simultaneous access to socket structure *******************************************************************************/ /** * @file * \brief Synchronous API implementation * */ #define _GNU_SOURCE /* for pthread_mutexattr_settype */ #include <stdlib.h> #if !defined(WIN32) && !defined(WIN64) #include <sys/time.h> #endif #include "MQTTClient.h" #if !defined(NO_PERSISTENCE) #include "MQTTPersistence.h" #endif #include "utf-8.h" #include "MQTTProtocol.h" #include "MQTTProtocolOut.h" #include "Thread.h" #include "SocketBuffer.h" #include "StackTrace.h" #include "Heap.h" #if defined(OPENSSL) #include <openssl/ssl.h> #endif #define URI_TCP "tcp://" #define BUILD_TIMESTAMP "##MQTTCLIENT_BUILD_TAG##" #define CLIENT_VERSION "##MQTTCLIENT_VERSION_TAG##" char* client_timestamp_eye = "MQTTClientV3_Timestamp " BUILD_TIMESTAMP; char* client_version_eye = "MQTTClientV3_Version " CLIENT_VERSION; static ClientStates ClientState = { CLIENT_VERSION, /* version */ NULL /* client list */ }; ClientStates* bstate = &ClientState; MQTTProtocol state; #if defined(WIN32) || defined(WIN64) static mutex_type mqttclient_mutex = NULL; static mutex_type socket_mutex = NULL; extern mutex_type stack_mutex; extern mutex_type heap_mutex; extern mutex_type log_mutex; BOOL APIENTRY DllMain(HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved) { switch (ul_reason_for_call) { case DLL_PROCESS_ATTACH: Log(TRACE_MAX, -1, "DLL process attach"); if (mqttclient_mutex == NULL) { mqttclient_mutex = CreateMutex(NULL, 0, NULL); stack_mutex = CreateMutex(NULL, 0, NULL); heap_mutex = CreateMutex(NULL, 0, NULL); log_mutex = CreateMutex(NULL, 0, NULL); socket_mutex = CreateMutex(NULL, 0, NULL); } case DLL_THREAD_ATTACH: Log(TRACE_MAX, -1, "DLL thread attach"); case DLL_THREAD_DETACH: Log(TRACE_MAX, -1, "DLL thread detach"); case DLL_PROCESS_DETACH: Log(TRACE_MAX, -1, "DLL process detach"); } return TRUE; } #else static pthread_mutex_t mqttclient_mutex_store = PTHREAD_MUTEX_INITIALIZER; static mutex_type mqttclient_mutex = &mqttclient_mutex_store; static pthread_mutex_t socket_mutex_store = PTHREAD_MUTEX_INITIALIZER; static mutex_type socket_mutex = &socket_mutex_store; void MQTTClient_init() { pthread_mutexattr_t attr; int rc; pthread_mutexattr_init(&attr); pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK); if ((rc = pthread_mutex_init(mqttclient_mutex, &attr)) != 0) printf("MQTTClient: error %d initializing client_mutex\n", rc); if ((rc = pthread_mutex_init(socket_mutex, &attr)) != 0) printf("MQTTClient: error %d initializing socket_mutex\n", rc); } #define WINAPI #endif static volatile int initialized = 0; static List* handles = NULL; static time_t last; static int running = 0; static int tostop = 0; static thread_id_type run_id = 0; MQTTPacket* MQTTClient_waitfor(MQTTClient handle, int packet_type, int* rc, long timeout); MQTTPacket* MQTTClient_cycle(int* sock, unsigned long timeout, int* rc); int MQTTClient_cleanSession(Clients* client); void MQTTClient_stop(); int MQTTClient_disconnect_internal(MQTTClient handle, int timeout); int MQTTClient_disconnect1(MQTTClient handle, int timeout, int internal, int stop); void MQTTClient_writeComplete(int socket); typedef struct { MQTTClient_message* msg; char* topicName; int topicLen; unsigned int seqno; /* only used on restore */ } qEntry; typedef struct { char* serverURI; #if defined(OPENSSL) int ssl; #endif Clients* c; MQTTClient_connectionLost* cl; MQTTClient_messageArrived* ma; MQTTClient_deliveryComplete* dc; void* context; sem_type connect_sem; int rc; /* getsockopt return code in connect */ sem_type connack_sem; sem_type suback_sem; sem_type unsuback_sem; MQTTPacket* pack; } MQTTClients; void MQTTClient_sleep(long milliseconds) { FUNC_ENTRY; #if defined(WIN32) || defined(WIN64) Sleep(milliseconds); #else usleep(milliseconds*1000); #endif FUNC_EXIT; } #if defined(WIN32) || defined(WIN64) #define START_TIME_TYPE DWORD START_TIME_TYPE MQTTClient_start_clock(void) { return GetTickCount(); } #elif defined(AIX) #define START_TIME_TYPE struct timespec START_TIME_TYPE MQTTClient_start_clock(void) { static struct timespec start; clock_gettime(CLOCK_REALTIME, &start); return start; } #else #define START_TIME_TYPE struct timeval START_TIME_TYPE MQTTClient_start_clock(void) { static struct timeval start; gettimeofday(&start, NULL); return start; } #endif #if defined(WIN32) || defined(WIN64) long MQTTClient_elapsed(DWORD milliseconds) { return GetTickCount() - milliseconds; } #elif defined(AIX) #define assert(a) long MQTTClient_elapsed(struct timespec start) { struct timespec now, res; clock_gettime(CLOCK_REALTIME, &now); ntimersub(now, start, res); return (res.tv_sec)*1000L + (res.tv_nsec)/1000000L; } #else long MQTTClient_elapsed(struct timeval start) { struct timeval now, res; gettimeofday(&now, NULL); timersub(&now, &start, &res); return (res.tv_sec)*1000 + (res.tv_usec)/1000; } #endif int MQTTClient_create(MQTTClient* handle, const char* serverURI, const char* clientId, int persistence_type, void* persistence_context) { int rc = 0; MQTTClients *m = NULL; FUNC_ENTRY; rc = Thread_lock_mutex(mqttclient_mutex); if (serverURI == NULL || clientId == NULL) { rc = MQTTCLIENT_NULL_PARAMETER; goto exit; } if (!UTF8_validateString(clientId)) { rc = MQTTCLIENT_BAD_UTF8_STRING; goto exit; } if (!initialized) { #if defined(HEAP_H) Heap_initialize(); #endif Log_initialize((Log_nameValue*)MQTTClient_getVersionInfo()); bstate->clients = ListInitialize(); Socket_outInitialize(); Socket_setWriteCompleteCallback(MQTTClient_writeComplete); handles = ListInitialize(); #if defined(OPENSSL) SSLSocket_initialize(); #endif initialized = 1; } m = malloc(sizeof(MQTTClients)); *handle = m; memset(m, '\0', sizeof(MQTTClients)); if (strncmp(URI_TCP, serverURI, strlen(URI_TCP)) == 0) serverURI += strlen(URI_TCP); #if defined(OPENSSL) else if (strncmp(URI_SSL, serverURI, strlen(URI_SSL)) == 0) { serverURI += strlen(URI_SSL); m->ssl = 1; } #endif m->serverURI = MQTTStrdup(serverURI); ListAppend(handles, m, sizeof(MQTTClients)); m->c = malloc(sizeof(Clients)); memset(m->c, '\0', sizeof(Clients)); m->c->context = m; m->c->outboundMsgs = ListInitialize(); m->c->inboundMsgs = ListInitialize(); m->c->messageQueue = ListInitialize(); m->c->clientID = MQTTStrdup(clientId); m->connect_sem = Thread_cre