Setting linkloss alertlevel on device through android application

RE: Setting linkloss alertlevel on device through android application

Ole Morten — Tue, 04 Mar 2014 14:20:34 GMT

If you found Balaji's reply useful, I'd be happy if you could accept it as an answer for this question, to clear it up. :-)

RE: Setting linkloss alertlevel on device through android application

balaji — Thu, 27 Feb 2014 13:27:06 GMT

yes it is clear, i tested this in debug mode both iphone and my android applications are writing alert values when i set. But linkloss alert works only, when i set value through ios application. I need to check my android application. Thank u.

RE: Setting linkloss alertlevel on device through android application

Balaji Srinivasan — Thu, 27 Feb 2014 12:52:32 GMT

Not sure if I understand you correctly. But the alert level value is sent by the phone using GATT Write Request. This will be received received, stored and responded to by the BLE Stack running on the device. The value thus stored is read using the API sd_ble_gatts_value_get by the application on the device side (as you have mentioned). Is this clear?

RE: Setting linkloss alertlevel on device through android application

balaji — Thu, 27 Feb 2014 12:41:33 GMT

thanks balaji, what about the device side. i can see sd_ble_gatts_value_get(p_lls->alert_level_handles.value_handle, 0, &len, p_alert_level); which is called when the linkloss disconnection happens. But how the alert level value is received and settled in stack when we write through alertlevel characteristics?

RE: Setting linkloss alertlevel on device through android application

Balaji Srinivasan — Thu, 27 Feb 2014 12:35:28 GMT

The app will be writing 0x02' (High Alert) or 0x01 (Mild Alert) or 0x00 (No Alert) to the Alert Level characteristic in the Link Loss service as mentioned here -> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.alert_level.xml

RE: Setting linkloss alertlevel on device through android application

balaji — Thu, 27 Feb 2014 12:30:07 GMT

Thank for the reply balaji, What is happening in the iphone proximity application, when we set the on tag alert levels?

RE: Setting linkloss alertlevel on device through android application

Balaji Srinivasan — Thu, 27 Feb 2014 12:13:19 GMT

Hi Balaji,

For Link Loss alerts, your Android application will need to discover 'Link Loss Service' on the tag and write to the 'Alert Level' characteristic which is included in it.

Hope this helps.

Cheers, Balaji