BLE/NRF error

no no no no no... writing does work!
just the callback function onWrite() is not implemented
I can both read and write / edit the value of certain characteristic, but could not call the onWrite() callback function
In my conception, I should write / edit the value of characteristic A, and then my ESP32 call the onWrite() callback function to verify this value. If the value is valid, ESP32 will change characteristic B to readable mode.
Just like some kind of encryption verification.

Using now GATTBrowser to check the service and the custom characteristics, look fine to me.

5 Attachments

Check issue #1777 Improve ESP32 implementation for fixed and open issues.

Thanks. Not much BLE related there however, I see only

• NRF.updateServices() needs fixing issue 2292
  
• BLE/NRF error , check issue 2493, issue 2292
  so I guess this patch mentioned above solves/helps with #2292 which is actually quite old and known
  
  

So it makes sense there is no info in the list about using BLE characteristics (writing callback + notifications) since nobody could try with NRF.setServices not working.

but the event is not fired, or is something wrong with my test code?

digitalWrite(D19,0);

function blink(duration){
  digitalWrite(D19,0);setTimeout(()=>{digitalWrite(D19,0);},duration);
}

NRF.setServices({
  0x1901: {
    0x1902: {
      value : "Hello",
      broadcast : true,
      readable : true,
      writable : true,
      notify : true,
      indicate: true,
      onWrite: (event) => {
        console.log("Got: ", event);
        blink(5000);
      }
    }
  }
});
// edit
Serial1.setConsole(1);

I can both read and write / edit the value of certain characteristic, but could not call the onWrite() callback function

Yes that is good, what I meant is that if you don't get the callback then you don't know what value was written so writing is not very useful.

I can read it after writing, so I can read the value I wrote. Just write => read.

read Hello
write world
read world

so write changes the value from Hello to world in my test, but the leds on D19 did not switch on and off.

Yes, yes, it is indeed this issue.

Thanks for looking into this!

You can force the console to stay on Serial1 even when connected with BLE with Serial1.setConsole(1) which really helps with debugging.

Also ESP32.setBLE_Debug(7) can help to display extra info too

I looked and there is some code for handling writes there, but on trying the code above and writing I get:

Uncaught Error: Too much recursion - the stack is about to overflow
Execution Interrupted

Is this what you see too? I'll have a look and see if I can figure out what's broken

Is this what you see too? I'll have a look and see if I can figure out what's broken

Yes, I see that too.

Well, that was a nightmare. Pretty much everything was broken.

But I have now fixed setServices, onWrite, and notifications/indications, so I think it should be ok if you try a 'cutting edge' build now

Hmm, seems to be a huge thing, still get this when writing

WARNING: Event:ESP_GATTS_WRITE_EVT gatts_if:4
WARNING: Event:ESP_GATTS_RESPONSE_EVT gatts_if:4
Uncaught Error: Too much recursion - the stack is about to overflow
Execution Interrupted
> 

Edit: GIT_COMMIT: "3076d5133" ups this is not the latest commit

Now with the correct version it works - Many thanks, will close issue 2493

>
>Event:ESP_GATTS_CONNECT_EVT gatts_if:4
Event:ESP_GATTS_CONNECT_EVT gatts_if:5
Event:ESP_GATTC_CONNECT_EVT gattc_if:3
gattc_event_handler: 40
Event:ESP_GAP_BLE_AUTH_CMPL_EVT
Event:ESP_GATTS_MTU_EVT gatts_if:4
Event:ESP_GATTS_MTU_EVT gatts_if:5
Event:ESP_GATTS_READ_EVT gatts_if:5
Event:ESP_GATTS_RESPONSE_EVT gatts_if:5
Event:ESP_GATTS_READ_EVT gatts_if:4
Event:ESP_GATTS_RESPONSE_EVT gatts_if:4
Event:ESP_GATTS_WRITE_EVT gatts_if:4
Event:ESP_GATTS_RESPONSE_EVT gatts_if:4
Got:  {
  "data": new Uint8Array([69, 115, 112, 114, 117, 105, 110, 111, 32]).buffer
 }
>

👍👍👍