Allow to set threshold on iGrillv3

[IceBotYT]

Hi there.

With the Weber iGrill app, I could set a temperature I want to alert at and I would receive a notification and the iGrill would beep at that temperature. I can recreate the notification with Home Assistant, but how do I have the iGrill beep at the set temperature?

Other than that, it works great! Thank you for your work on this!

[IceBotYT]

I see you have found the characteristics for the thresholds, yet they are not implemented yet. Is there any way I could assist in getting this implemented? https://github.com/1mckenna/esp32_iGrill/blob/main/esp32_iGrill.ino#L158

[IceBotYT]

I have now created a fork with the possible functionality of it. It is available here

Some known issues:

• iGrill will not silence when threshold set to 0, nor when power on iGrill button is shortly pressed
• Thresholds do not disappear when iGrill is disconnected

[IceBotYT]

If anyone could help me fix these issues, that would be greatly appreciated!!