Hello guys,

I would like to know how to do (or adapt) firmware for wifi router work only as a TCP server and Serial Port.

There is a module called HLK-RM04, this module is a RT5350 chip base module is a low cost, but my import policy does not help, and the final value increases up to 4x.

My expectation is to be able to use a wifi router sold locally, maybe a Dlink DIR-300 (RT5350 based) or other, to act as TCP server with serial port (9600 baud to communicate with MCU).

I want to control the light bulbs in my house with relays, and I need a serial port of TCP server.

I know now program the MCU to receive data in serial format, and also make the app Android phone.

I was already using a mobile phone to do the same function of the HLK-RM04 module, but it also has a high cost in my area.

Any options suggested are welcome!

Thank you.

I'm not certain I understand, but I think any openWrt router with usb can use the ser2net program with usb-serial to do what you want. 

For example, see post 6 in this thread: http://www.picaxeforum.co.uk/showthread … ity-System

You might get more specific suggestions if you post your locale.

(Last edited by lizby on 1 Aug 2014, 19:39)

well, I bought a rm04 HLK-module for testing.

and discovered that I can disable wifi (via hardware and software).

but (ser2net) service can not connect more than one client at a time.

You could try to buy 9-10$ routers from aliexpress, they are flashable to openwrt using my hack method. These routers have serial console, you can use it as serial port.
http://mysku.ru/blog/aliexpress/26886.html (use google translate)

(Last edited by hackru on 13 Sep 2014, 10:41)

Great advice. Can you post links from Aliexpress to check those routers ?

Sorry, didn't understand your question.

Probably these: http://www.aliexpress.com/item/1pcs-lot … 96069.html

Here's another page on hacking them: http://my-embedded.blogspot.com/2013/12 … 5350f.html