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nrf 51 with android

hi guys ; i have already an application on android phone that can read and write charchtéristic i also followed the tutorial Bluetooth low energy Characteristics, a beginner's tutorial but i have problem when i try to change state of one gpio (2 for example) accordin on the value of charchteristic it doesn't work . the change of the state that i do is inside of the function our_char_add also for your infomation the change of the characteristic works very well but the gpio pin still without any change

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