How to Enable Battery Profile Notification

Hello Pradeep,

Handles are only relative to a given server configuration, so you can't reference a handle from one document and apply to a different server. To enable Notifications, you need to write to the Client Characteristic Config Descriptor (CCCD) for the Battery Service UUID (0x180F).

Best wishes

Hey JXS,

I am able to read Battery Level using UUID i.e 0x180F
But the problem is i need to enable Notification.
Can u guide me in doing the Same.

Thanks

Hey JXS,

Thank you very much. It was very helpful for me.

I got the Handle values and While using Ble device Monitor i am able to activate notification.

I tried the same into central code to activate the Notification

these are the details:

0x1F 31 0x2902 Client Characteristic Configuration

0x1E 30 0x2A19 Battery Level

So using the sample code which was given in the Central code i developed this code

attWriteReq_t pWReq;
	  attReadReq_t pRReq;
	  char status;
	    // Start or cancel RSSI polling
	    if (state == BLE_STATE_CONNECTED)
	    {
	        pWReq.pValue = GATT_bm_alloc(connHandle, ATT_WRITE_REQ, 1, NULL);
	                if ( pWReq.pValue != NULL )
	                {   delay_ms(200);
	                	pWReq.handle =0x001F;
	                	pWReq.len = 2;
	                	pWReq.pValue[0] = 0x01;
	                	pWReq.pValue[1]=0x00;
	                	pWReq.sig = 0;
	                	pWReq.cmd = 0;

	                	status = GATT_WriteCharValue(connHandle, &pWReq, selfEntity);
	                  if ( status != SUCCESS )
	                  {
	                    GATT_bm_free((gattMsg_t *)&pWReq, ATT_WRITE_REQ);
	                  }

	    	  delay_ms(500);
	       // LCD_WRITE_STRING("RSSI Cancelled", LCD_PAGE4);
	        pRReq.handle=0x001E;
	        VOID GATT_ReadCharValue(connHandle, &pRReq, selfEntity);
	      }
	    }

I am able to read the Battery Level which is correct.
and Write is also happening as its getting increased every time when write happen but i'am not able to get the notified data which i am getting properly in phone and BLE Device Monitor.

So can u please guide me where i am going wrong??

Thanks

Hi Pradeep,

Since you have a good working reference (BLE Dev Monitor), I would suggest taking a BLE air packet sniffer trace of the good case and compare it to your case. That should give you a clue as to if the notifications are being sent and drive the next steps.

Best wishes