fix(examples): Modified code to led turn on/off properly (IDFGH-16294)

[piratagit]

Description

Congrats for the great work, big fan here !
I was studying with the Bluetooth examples, and notice that this script was suppose to check if was written on an specific GATT attribute the value ON or OFF, and turn on/ off the led, but the code was only checking if was written any value on the attribute and the OFF wasn't working. I corrected the main/main.c file and it worked, but I notice too that when the device starts, starts with the led GREEN, but when you write the attribute to turn OFF, them ON, the device turn ON in a white color led, so I changed the main/src/led.c file too, to make it turn GREEN when you apply the command, the same color as when the device starts.

Related

Testing

Build on idf.py, flashed and tested on esp32c6

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