#include "net.h" #define MQTT_SERVER "mqtt://broker.hivemq.com:1883" struct mg_connection *mqtt_connection; const char *mqtt_subscribe_topic = "mg/rx"; const char *mqtt_publish_topic = "mg/tx"; struct mg_mgr mgr; // Mongoose event manager struct mg_tcpip_if mif = {.mac = {2, 0, 1, 2, 3, 5}}; // network interface void mqtt_publish(const char *message) { struct mg_mqtt_opts opts = {}; opts.topic = mg_str(mqtt_publish_topic); opts.message = mg_str(message); if (mqtt_connection) mg_mqtt_pub(mqtt_connection, &opts); } static void fn(struct mg_connection *c, int ev, void *ev_data) { if (ev == MG_EV_MQTT_OPEN) { MG_INFO(("%lu CONNECTED to %s", c->id, MQTT_SERVER)); struct mg_mqtt_opts opts = {}; opts.topic = mg_str(mqtt_subscribe_topic); mg_mqtt_sub(c, &opts); MG_INFO(("%lu SUBSCRIBED to %s", c->id, mqtt_subscribe_topic)); } else if (ev == MG_EV_MQTT_MSG) { // Received MQTT message struct mg_mqtt_message *mm = (struct mg_mqtt_message *) ev_data; MG_INFO(("%lu RECEIVED %.*s <- %.*s", c->id, (int) mm->data.len, mm->data.buf, (int) mm->topic.len, mm->topic.buf)); exec_command(mm->data.buf, mm->data.len); } else if (ev == MG_EV_CLOSE) { MG_INFO(("%lu CLOSED", c->id)); mqtt_connection = NULL; } } static void timer_fn(void *arg) { struct mg_mgr *mgr = (struct mg_mgr *) arg; struct mg_mqtt_opts opts; memset(&opts, 0, sizeof(opts)); opts.clean = true; if (mif.state == MG_TCPIP_STATE_READY && mqtt_connection == NULL) { mqtt_connection = mg_mqtt_connect(mgr, MQTT_SERVER, &opts, fn, NULL); } // MG_INFO(("Eth: %d, MQTT: %p", mif.state, mqtt_connection)); } void net_init(void) { // Set Mongoose logging function to a serial print mg_mgr_init(&mgr); mif.driver = &mg_tcpip_driver_w5500; mif.driver_data = &spi; mg_tcpip_init(&mgr, &mif); // Start a timer that keeps MQTT connection alive mg_timer_add(&mgr, 3000, MG_TIMER_REPEAT, timer_fn, &mgr); }