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67 lines
2.6 KiB
C
67 lines
2.6 KiB
C
// Copyright (c) 2020 Cesanta Software Limited
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// All rights reserved
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//
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// Example MQTT client. It performs the following steps:
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// 1. Connects to the MQTT server specified by `s_url` variable
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// 2. When connected, subscribes to the topic `s_topic`
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// 3. Publishes message `hello` to the `s_topic`
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// 4. Receives that message back from the subscribed topic and exits
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//
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// To enable SSL/TLS for this client, build it like this:
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// make MBEDTLS_DIR=/path/to/your/mbedtls/installation
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#include "mongoose.h"
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static const char *s_url = "mqtt://broker.hivemq.com:1883";
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static const char *s_topic = "mg/mq-clnt-test";
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static int s_qos = 1;
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static void fn(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
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if (ev == MG_EV_OPEN) {
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// c->is_hexdumping = 1;
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} else if (ev == MG_EV_ERROR) {
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// On error, log error message
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LOG(LL_ERROR, ("%p %s", c->fd, (char *) ev_data));
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} else if (ev == MG_EV_CONNECT) {
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// If target URL is SSL/TLS, command client connection to use TLS
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if (mg_url_is_ssl(s_url)) {
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struct mg_tls_opts opts = {.ca = "ca.pem"};
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mg_tls_init(c, &opts);
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}
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} else if (ev == MG_EV_MQTT_OPEN) {
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// MQTT connect is successful
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struct mg_str topic = mg_str(s_topic), data = mg_str("hello");
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LOG(LL_INFO, ("CONNECTED to %s", s_url));
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mg_mqtt_sub(c, &topic, s_qos);
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LOG(LL_INFO, ("SUBSCRIBED to %.*s", (int) topic.len, topic.ptr));
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mg_mqtt_pub(c, &topic, &data, s_qos, false);
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LOG(LL_INFO, ("PUBSLISHED %.*s -> %.*s", (int) data.len, data.ptr,
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(int) topic.len, topic.ptr));
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} else if (ev == MG_EV_MQTT_MSG) {
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// When we get echo response, print it
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struct mg_mqtt_message *mm = (struct mg_mqtt_message *) ev_data;
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LOG(LL_INFO, ("RECEIVED %.*s <- %.*s", (int) mm->data.len, mm->data.ptr,
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(int) mm->topic.len, mm->topic.ptr));
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}
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if (ev == MG_EV_ERROR || ev == MG_EV_CLOSE || ev == MG_EV_MQTT_MSG) {
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LOG(LL_INFO, ("Got event %d, stopping...", ev));
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*(bool *) fn_data = true; // Signal that we're done
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}
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}
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int main(void) {
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struct mg_mgr mgr;
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struct mg_mqtt_opts opts = {.qos = s_qos,
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.will_topic = mg_str(s_topic),
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.will_message = mg_str("goodbye")};
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bool done = false; // Event handler sets this to true
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mg_mgr_init(&mgr); // Initialise event manager
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mg_mqtt_connect(&mgr, s_url, &opts, fn, &done); // Create client connection
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while (done == false) mg_mgr_poll(&mgr, 1000); // Loop until done
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mg_mgr_free(&mgr); // Finished, cleanup
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return 0;
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}
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