StartUpdatesAsync on characteristic Android error

Steps to reproduce

1. Download xamarin-bluetooth-le from master branch

2. Launch BLE explorer

3. Coonect to a Device with custom service - with 2 characteristics

• 1 Write without Response (1)
• 1 update with Notify (2)

1. try to write and update

Expected behavior

Write on characteristic 1 send data to my device Update on characteristic 2 get data when my device send data

Actual behavior

I connected to my device, discover services, and get characteristics.

• carac 1 : Write without Response (1)
• carac 2 : update with Notify (2)

when i wrote on mu (1), its ok when i try to update (2), my application give an exeption.

Crashlog

I got an exeption : “Gatt SetCharacteristicNotification FAILED.”

i check in source code and found that :

/ In order to subscribe to notifications on a given characteristic, you must first set the Notifications Enabled bit // in its Client Characteristic Configuration Descriptor. See https://developer.bluetooth.org/gatt/descriptors/Pages/DescriptorsHomePage.aspx and // https://developer.bluetooth.org/gatt/descriptors/Pages/DescriptorViewer.aspx?u=org.bluetooth.descriptor.gatt.client_characteristic_configuration.xml // for details.

i dont know why

if (!_gatt.SetCharacteristicNotification(_nativeCharacteristic, true))
                throw new CharacteristicReadException("Gatt SetCharacteristicNotification FAILED.");

return false 😕

Configuration

Version of the Plugin: e.g. 1.2.1

Platform: e.g. Android 4.4.2

Device: e.g. wiko rainbow 4G

[vimalaven]

Same, it’s not working for me too. The event never gets triggered. Any idea?

[tcatalano]

I know this is an old thread but I am having same problem with Characteristic.ValueUpdated not firing. Have verified with nrfConnect that notification is definitely being sent from device. Have tried 1.3 and 2.0 packages.

Was there a resolution? Thanks for any info.