start mqtt client (based on paho.mqtt.c), basically works

2026-03-13 23:56:55 +03:00
parent 767bb2b382
commit feb86b15f8
114 changed files with 37878 additions and 6 deletions
--- a/3rd/paho.mqtt.c/src/samples/MQTTClient_subscribe.c
+++ b/3rd/paho.mqtt.c/src/samples/MQTTClient_subscribe.c
@@ -0,0 +1,118 @@
+/*******************************************************************************
+ * Copyright (c) 2012, 2025 IBM Corp., Ian Craggs
+ *
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v2.0
+ * and Eclipse Distribution License v1.0 which accompany this distribution. 
+ *
+ * The Eclipse Public License is available at 
+ *   https://www.eclipse.org/legal/epl-2.0/
+ * and the Eclipse Distribution License is available at 
+ *   http://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * Contributors:
+ *    Ian Craggs - initial contribution
+ *******************************************************************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "MQTTClient.h"
+
+#define ADDRESS     "tcp://test.mosquitto.org:1883"
+#define CLIENTID    "ExampleClientSub"
+#define TOPIC       "MQTT Examples"
+#define PAYLOAD     "Hello World!"
+#define QOS         1
+#define TIMEOUT     10000L
+
+volatile MQTTClient_deliveryToken deliveredtoken;
+
+void delivered(void *context, MQTTClient_deliveryToken dt)
+{
+    printf("Message with token value %d delivery confirmed\n", dt);
+    deliveredtoken = dt;
+}
+
+int msgarrvd(void *context, char *topicName, int topicLen, MQTTClient_message *message)
+{
+    printf("Message arrived\n");
+    printf("     topic: %s\n", topicName);
+    printf("   message: %.*s\n", message->payloadlen, (char*)message->payload);
+    MQTTClient_freeMessage(&message);
+    MQTTClient_free(topicName);
+    return 1;
+}
+
+void connlost(void *context, char *cause)
+{
+    printf("\nConnection lost\n");
+    if (cause)
+    	printf("     cause: %s\n", cause);
+}
+
+int main(int argc, char* argv[])
+{
+    MQTTClient client;
+    MQTTClient_connectOptions conn_opts = MQTTClient_connectOptions_initializer;
+    int rc;
+
+    const char* uri = (argc > 1) ? argv[1] : ADDRESS;
+    printf("Using server at %s\n", uri);
+
+    if ((rc = MQTTClient_create(&client, uri, CLIENTID,
+        MQTTCLIENT_PERSISTENCE_NONE, NULL)) != MQTTCLIENT_SUCCESS)
+    {
+        printf("Failed to create client, return code %d\n", rc);
+        rc = EXIT_FAILURE;
+        goto exit;
+    }
+
+    if ((rc = MQTTClient_setCallbacks(client, NULL, connlost, msgarrvd, delivered)) != MQTTCLIENT_SUCCESS)
+    {
+        printf("Failed to set callbacks, return code %d\n", rc);
+        rc = EXIT_FAILURE;
+        goto destroy_exit;
+    }
+
+    conn_opts.keepAliveInterval = 20;
+    conn_opts.cleansession = 1;
+    if ((rc = MQTTClient_connect(client, &conn_opts)) != MQTTCLIENT_SUCCESS)
+    {
+        printf("Failed to connect, return code %d\n", rc);
+        rc = EXIT_FAILURE;
+        goto destroy_exit;
+    }
+
+    printf("Subscribing to topic %s\nfor client %s using QoS%d\n\n"
+           "Press Q<Enter> to quit\n\n", TOPIC, CLIENTID, QOS);
+    if ((rc = MQTTClient_subscribe(client, TOPIC, QOS)) != MQTTCLIENT_SUCCESS)
+    {
+    	printf("Failed to subscribe, return code %d\n", rc);
+    	rc = EXIT_FAILURE;
+    }
+    else
+    {
+    	int ch;
+    	do
+    	{
+        	ch = getchar();
+    	} while (ch!='Q' && ch != 'q');
+
+        if ((rc = MQTTClient_unsubscribe(client, TOPIC)) != MQTTCLIENT_SUCCESS)
+        {
+        	printf("Failed to unsubscribe, return code %d\n", rc);
+        	rc = EXIT_FAILURE;
+        }
+    }
+
+    if ((rc = MQTTClient_disconnect(client, 10000)) != MQTTCLIENT_SUCCESS)
+    {
+    	printf("Failed to disconnect, return code %d\n", rc);
+    	rc = EXIT_FAILURE;
+    }
+destroy_exit:
+    MQTTClient_destroy(&client);
+exit:
+    return rc;
+}