Decode incoming messages as JSON

.gitignore

@@ -1,3 +1,4 @@
+*.pcapng
 *.png
 *.stl
 config.custom.h

server/ttn-app-server/TTNAppServer.mjs

@@ -56,7 +56,16 @@ class TTNAppServer {
 	}
 	
 	async handle_message(topic, message_buffer) {
-		console.log(arguments);
+		let message = message_buffer.toString("utf8"),
+			message_object = null;
+		try {
+			message_object = JSON.parse(message);
+		} catch(error) {
+			this.log.log(error);
+			return false;
+		}
+		
+		this.log.log(`[mqtt/handler] ${topic}: `, message_object);
 		// await this.message_handler.handle(payload);
 	}
 }