I resolved this. First of all we need to check if the Characteristic has the write operation in it for that you can download an app called BLE scanner from play store and connect to that device. When we connect to that BLE we will be able to see the available services and characteristics of the BLE Peripheral. And there we need to check which characteristics has write operation. So if you try to do write characteristics for characteristics which doesn’t have a write operation in peripheral it will give exception write not permitted.
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