Blog about IoT, Arduino and ESP8266
Why do you have the start sent on serial from ESP to the Hub? Serial.begin(74880); Serial.print("start");Is 74880bps the default serial speed? From what I've seen on the net, there is an initial communication at 2400bps and after they switch to 115200bps in a data mode.
Because I communicate with esp, I can define any baud rate that I want as long as it's same as defined in esp code. also this is normal serial communication without any special lego protocol.