ESP8266 Community Forum

- Sun Aug 23, 2015 12:08 pm #26894 Looks like it could be a queue overflow. If the ESP is communicating at 115200 baud, then it will be sending a character every 86 microseconds. The serial driver grabs these bytes and puts them in a queue. The size of the queue will vary, but it will be a finite size. Either the serial driver is not being serviced fast enough (and a new character overwrites the UART receive register before the driver grabs the current one) or your application does not read the data from the serial receive queue fast enough and the queue overflows. I think the latter is most likely.