Interfacing an nRF51 with an ESP8266 using AT commands over UART

RE: Interfacing an nRF51 with an ESP8266 using AT commands over UART

awneil — Tue, 05 Jul 2016 10:54:05 GMT

Not off hand - but I would look first at using a State Machine. Use the response termination character as the cue to review the received string ...

Not sure how mbed does it - you could take a look: developer.mbed.org/.../

RE: Interfacing an nRF51 with an ESP8266 using AT commands over UART

Sensors — Tue, 05 Jul 2016 10:37:28 GMT

That's helpful to know, thanks.

You don't happen to have any examples of how to deal with AT responses, do you? I'm still unable to figure this out unfortunately. I just can't see how to utilise the UART Rx callback to record the stream of character responses, and then check this against what I might expect the response to be...

RE: Interfacing an nRF51 with an ESP8266 using AT commands over UART

awneil — Tue, 05 Jul 2016 09:53:06 GMT

There is usually an AT Command to turn off echo - ATE0

It is in the nature of AT commands that different commands do different things - so they will naturally have different responses to indicate what they've done, or what has failed.

Same applies to other command-response systems, really ...

RE: Interfacing an nRF51 with an ESP8266 using AT commands over UART

Sensors — Tue, 05 Jul 2016 09:43:11 GMT

That was what I wanted to do. But it's awkward when the ESP8266 seems to echo back everything that is sent, and has a different response for each command. I suppose what I can't figure out is how to actually implement this checking when the commands are sent. Are you aware of any resources that might point me in the right direction with this?

RE: Interfacing an nRF51 with an ESP8266 using AT commands over UART

awneil — Mon, 04 Jul 2016 20:16:30 GMT

Nothing specific to ESP8266 - it's the same for any device using AT Commands:

You need to study the AT Commands Manual for the device: that will tell you what response(s) can be returned by each command - and which of those indicate "success" or "failure".

The key thing is not to rely upon delays - always pay attention to the responses.