add: mongoose for connections and mqtt

src/handlers/mqtt.c

@@ -0,0 +1,37 @@
+#include <logger.h>
+#include <handlers.h>
+#include <models/controller.h>
+
+void
+handler_mqtt(struct mg_connection *nc, int ev, void *p) {
+  struct mg_mqtt_message *msg = (struct mg_mqtt_message *) p;
+  (void) nc;
+
+  if (ev != MG_EV_POLL) LOG_DEBUG("USER HANDLER GOT EVENT %d\n", ev);
+
+  switch (ev) {
+    case MG_EV_CONNECT: {
+      struct mg_send_mqtt_handshake_opts opts;
+      memset(&opts, 0, sizeof(opts));
+      // TODO add password
+
+      mg_set_protocol_mqtt(nc);
+      mg_send_mqtt_handshake_opt(nc, global_controller->name, opts);
+      break;
+    }
+    case MG_EV_MQTT_CONNACK:
+      if (msg->connack_ret_code != MG_EV_MQTT_CONNACK_ACCEPTED) {
+        LOG_DEBUG("Got mqtt connection error: %d\n", msg->connack_ret_code);
+        exit(1);
+      }
+      break;
+    case MG_EV_MQTT_PUBACK:
+      LOG_DEBUG("Message publishing acknowledged (msg_id: %d)\n", msg->message_id);
+      break;
+    case MG_EV_MQTT_SUBACK:
+      LOG_DEBUG("Subscription acknowledged, forwarding to '/test'\n");
+      break;
+    case MG_EV_CLOSE:
+      LOG_DEBUG("Connection closed\n");
+  }
+}