ESP8266 Community Forum

May be this is not the correct place but I give it a try:

Hello can someone please help me with the following:
I want to communicate with a MODBUS TCP client to a ESP8266 ESP01 card.
I use the sketch of http://en.trialcommand.com/blog/esp8266 ... libraries/
This works, however my Modbus TCP client throws an exception
"Incorrect length in response"
This happens when I send "node.writeMultipleRegisters(xx,yy)" the client should respond with an acknowledge, I have the impression that this acknowledge message does not have the correct length.
Might this be a library issue?
Your help is very much appreciated.

If this is not the write place to ask this I apologize please direct me to the correct one, Thanks!
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In the 'references' section of your shared link, there is a link to another article named 'Update ESP8266 Industrial Modbus TCP IP V2.0' have you checked that content along with all the videos inside?

Hello thank you for answering, I found that my ModbusTCP client had a bug which caused the problem, thanks again for your support, Ad