Issue with http request - Says http not open

[fabien1506]

KCS firmware not support tcp by modbus, only RS485 modbus, but KC868-A8 without RS485 port.

Yes ok understood that.
But my issue is still existing with the http commands :

When I am trying : http://192.168.1.200/ctrl.cgi?secret=abc...=0&value=0
I have the answer : {"code":-2,"status":"http not open"} 

When I am trying : http://192.168.1.200/ctrl.cgi?secret=abc...=0&value=0
I have the answer : { "outputs": [0, 0, 0, 0, 0, 0, 0, 0], "status": "success", "code": 0 }