iOS Notifications Error - Puck.js - Solved (clear your iOS bluetooth cache when you update your services)

Hey everyone,

Really enjoying getting back into working with my Puck.js v 2.0b Firmware 2v14

I'm trying to get the Puck to notify my iOS app (Xcode 13.4), and I am able to find and connect to the Puck, discover the services and custom characteristic, but when I try to setNotifyValue(true, for: customCharacteristic) I get the following error and notifications are clearly do not work when I press the button:

ERROR updating notification state error=Error Domain=CBATTErrorDomain Code=6 "The request is not supported." UserInfo={NSLocalizedDescription=The request is not supported.}

The Puck.js code I am using is from the documentation:

var count = 0;

NRF.setServices({
  0xBCDE : {
    0xABCD : {
      value: "Hello",
      maxLen : 20,
      notify: true
    },
  }
});

setWatch(function() {
  count = count + 1;
  NRF.updateServices({
    0xBCDE : {
      0xABCD : {
        value : "World "+count+"!",
        notify: true
      }
    }
  });
}, BTN, { repeat:true, edge:"rising", debounce: 50 });

Appreciate any guidance.
Thanks,
Narath

Update: I added additional code on the iOS side to check the characteristic, and it reports only:

Properties CBCharacteristicProperties(rawValue: 2)
read

Okay - got it solved! It was due to the iOS Bluetooth caching. Since I had connected to the device at some point, it cached the initial service and characteristics (which were only read). I did try turning Bluetooth off at the swipe down menu but this apparently did not clear it.

To clear the iOS bluetooth cache I do this:

• settings > Bluetooth > Turn off - wait a bit, turn back on
  
  

This did the trick, and now setting notify works correctly, and I get notifications! Woot - go espruino!

Okay - got it solved! It was due to the iOS Bluetooth caching

Great! Thanks for letting us know!

I'm afraid this does seem to be a common issue when developing Bluetooth devices with iOS :)