Comments on: Web Server with NodeMCU WebSocket

By: kamlesh

kamlesh — Fri, 14 May 2021 06:32:43 +0000

hello i want to see my sensor values from anywhere in the world. So how do i send data to global website. Please help

By: Fabio Rocchi

Fabio Rocchi — Wed, 11 Mar 2020 14:55:41 +0000

Hello, Roland ,
I just went on with websockets , and I must thank you again for your hint on ai2 extension ...
Now , I am facing ( again! ) with a problem when I try to exchange TXT messages between esp8266 and my AI2 app through websockets : all goes ok when I send a pre-established message ( or command ) , but all goes wrong if I try to send ( and decode ) a free TXT msg (like a file name on an SDCard )...
Would Async mode be easier ?
Thanks again
Fabio R.

By: Fabio

Fabio — Wed, 05 Jun 2019 18:07:00 +0000

In reply to Roland Pelayo.

Hi ,
Thank you for your kindness , I'll give it a try and will ( eventually ) post a feedback if everything goes well .

My best regards ,

Fabio R. - Italy

By: Roland Pelayo

Roland Pelayo — Tue, 04 Jun 2019 22:09:02 +0000

In reply to Fabio.

Hi,

I found an extension for websocket for the app inventor: https://community.appybuilder.com/t/websocket-client-extension/1761?u=taifun

I haven’t tested that but I hope it helps you with your problem

By: Fabio

Fabio — Tue, 04 Jun 2019 12:02:43 +0000

Hello ,
That's exactly what I would like to do to control a relay remotely : my huge difficulty lies on phone side.. I want to write small app with AppInventor 2 , but I do not know how to set it up to make the initial connection and switch to Websocket afterwards ( maybe I need a specific component on AI2 ..) , and this possibly is because I do ignore the very basics of websockets.
Any suggestion or... should I give up ?
Thank you so much ,
Fabio R.

By: Danghai

Danghai — Mon, 28 Jan 2019 19:43:02 +0000

Thank you so much for your amazing tutorial.
As you wrote "Another advantage of using WebSocket is that you can send or receive data on the server without refreshing the page, like in the NodeMCU Ajax tutorial but easier. I will discuss this on my future tutorials". Would you please send me or post a tutorial about how to send and display an A0 analog pin data on the webpage together with the above buttons: on and off by using the webSocket without refreshing manually the webpage.
Thanks a lot!

By: Gergely

Gergely — Tue, 20 Nov 2018 22:08:48 +0000

Hi Roland!

Thank you for this tutorial. It works now, but at the beginnig I had problems because the code did not compile. I am using Windows 8.1, Arduino 1.6.8 with the websocket library you added as a link. The error was:

exit status 1
'webSocketEvent' was not declared in this scope

After some research I found out that I must add to the init part of the code
void webSocketEvent(uint8_t num, WStype_t type, uint8_t * payload, size_t lenght);

By: RoySeberg

RoySeberg — Mon, 20 Aug 2018 21:30:13 +0000

Or even more simply: send A0 analog pin data as fast as the converter in the ESP8266 can produce a new byte

By: RoySeberg

RoySeberg — Mon, 20 Aug 2018 21:26:14 +0000

Turning the LED on and off works fine but how do I send data from the NodeMCU to the client?
For instance, I want to send a double integer that contains 24 bits of data data from a 24 bit ADC every few milliseconds continuously. Can it be done?

By: John

John — Tue, 03 Jul 2018 12:00:06 +0000

Amazing tutorials. I am looking to set it up and have a magnetic door switch so it can sense when the door/window closes/opens. I would like it to have its current status (live) in a web page and also send it to a server its status. I would like to ask if you guide me, please.