nodemcu-tool upload *.lua && nodemcu-tool terminal

lua/mqtt.lua

@@ -0,0 +1,37 @@
+
+
+m = mqtt.Client(hostname, 120)
+
+m:lwt("/lwt", "offline", 0, 0)
+
+m:on("connect", function(client) print ("connected") end)
+m:on("offline", function(client) print ("offline") end)
+
+
+m:on("message", function(client, topic, data) 
+  print("MQTT: msg recieved: "..topic) 
+  if data ~= nil then
+    print(data)
+  end
+end)
+
+-- for TLS: m:connect("192.168.11.118", secure-port, 1)
+m:connect("departmentofinter.net", 1883, 0, function(client)
+  print("connected")
+  -- Calling subscribe/publish only makes sense once the connection
+  -- was successfully established. You can do that either here in the
+  -- 'connect' callback or you need to otherwise make sure the
+  -- connection was established (e.g. tracking connection status or in
+  -- m:on("connect", function)).
+
+  -- subscribe topic with qos = 0
+  client:subscribe("/topic", 0, function(client) print("subscribe success") end)
+  -- publish a message with data = hello, QoS = 0, retain = 0
+  client:publish("/topic", "hello", 0, 0, function(client) print("sent") end)
+end,
+function(client, reason)
+  print("failed reason: " .. reason)
+end)
+
+m:close();
+-- you can call m:connect again