connection between nRF52 and android bluetooth

[Parita]

I have an android smartphone of bluetooth version 4 and i am developing one application where i am using nRF52 (bluetooth version 5). Is it possible to write data from the custom app by using mobile's bluetooth to the nRF52 device? I am using the custom uuid to write data from the custom app to the bluetooth module but after connecting GATT service i cannot write data to the nRF52 bluetooth module. Please help me in this.

[ovrebekk]

Hi Parita

Bluetooth 5 is backwards compatible with Bluetooth 4.0, so it should be possible for your nRF52 device running the BT 5 stack to connect to your phone and exchange data over a proprietary service. 

Have you tried to base your application on the Android-nRF-Blinky example?

It sets up the proprietary Blinky service, and allows the app to talk to an nRF52 device running the ble_app_blinky example from the nRF5 SDK. 

Best regards
Torbjørn

[awneil]

ovrebekk said:

Bluetooth 5 is backwards compatible with Bluetooth 4.0, so it should be possible for your nRF52 device running the BT 5 stack to connect to your phone and exchange data over a proprietary service

Provided, of course, that your nRF code does not rely upon any BT 5 features!

[Parita]

Actually i am developing an application where i want to write data in the nRF52 module using android app. I am using writeCharacteristic() method. But i cannot able to write data on the module.Can you please help me

[awneil]

So what have you tried?

What results were you expecting?

What results are you actually getting?

What testing / investigation / debugging have you done to account for the difference(s) ?

Have you seen these tutorials on BLE Services & Characteristics:

https://devzone.nordicsemi.com/nordic/short-range-guides/b/bluetooth-low-energy/posts/ble-services-a-beginners-tutorial

https://devzone.nordicsemi.com/nordic/short-range-guides/b/bluetooth-low-energy/posts/ble-characteristics-a-beginners-tutorial

[Parita]

I am initializing GATT service and before that i create a method which will discover the bluetooth devices/modules.  After searching i can connect with the chosen bluetooth device from the list of other bluetooth devices/modules. My android phone and the bluetooth module is connected with each other, but while sending/writing data to the bluetooth module from android device, i am using BluetoothGattCallback. There i am getting  android.bluetooth.BluetoothGattCharacteristic.setValue() as null refernce. The data is getting from android device but while sending to nRF52 it is not sending there.

[ovrebekk]

Hi 

Are you using the Nordic Android BLE library underneath, or doing everything on top of the core API's?

I would strongly suggest using our libraries, as they handle a lot of the busy work of setting up and accessing BLE devices in your application. 

Best regards
Torbjørn