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How to notify GATT characteristic to send new sensor value to GATT client (custom BLE service)

BlueZ: How to set up a GATT server from the command lineBLE Android, can't enable more than 1 notify on read characteristicsSending GATT Attributes Client -> ServerAfter Pairing to BlueTooth LE and get Gatt/Characteristics and Descriptors for Custom Device What next?Q: Notify and write to Gatt CharacteristicWhen/How is a BLE GATT Notify/Indicate is send on physical layerHow to time a BLE GATT exchange with Android Bluetooth APIs?Issue when using RxBleClient for scanning BLE devices which are in the backgroundBLE, the more characteristics and services the more slowlyBLE NOTIFY characteristic not notifying

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0

I'm trying to notify a GATT characteristic where an external BLE GATT client has registered to (pure BLE / no mobile device lib). I can successfully register for notify with my external GATT client (running on a microcontroller). However, when updating the characteristic on Movesense, no notify event seems to arrive at GATT client.
The characteristic value is written in notify callback, when new sensor data is available via asyncPut():

WB_RES::Characteristic newCharValue;
...
asyncPut(WB_RES::LOCAL::COMM_BLE_GATTSVC_SVCHANDLE_CHARHANDLE(),
 AsyncRequestOptions::Empty,
 mSvcHandle,
 mCharHandle,
 newCharValue);

The GATT service is created based on CustomGATTSvcClient example.
The characteristic properties are READ, WRITE, NOTIFY.
The characteristic value is written after the handles are successfully assigned from post and get callback.

bluetooth bluetooth-lowenergy gatt movesense

share|improve this question

asked Mar 22 at 17:19

HenrixHenrix

337

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  What BLE stack? Firmware? Hardware? Is the code you added is a snippet from your firmware or client? Most firmware implementations I saw have separate API calls: one to update the characteristic's value and another to trigger a notification - see if that is the case.
  
  – bavaza
  Mar 24 at 8:23
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If you use an app such as nRF connect, do you receive the notification there? And maybe you need to subscribe the characteristics first. In nRF connect there is a button for this also, so you can try out there.
  
  – maze
  Mar 27 at 9:20
  

  
  
  
  

add a comment | 

0

I'm trying to notify a GATT characteristic where an external BLE GATT client has registered to (pure BLE / no mobile device lib). I can successfully register for notify with my external GATT client (running on a microcontroller). However, when updating the characteristic on Movesense, no notify event seems to arrive at GATT client.
The characteristic value is written in notify callback, when new sensor data is available via asyncPut():

WB_RES::Characteristic newCharValue;
...
asyncPut(WB_RES::LOCAL::COMM_BLE_GATTSVC_SVCHANDLE_CHARHANDLE(),
 AsyncRequestOptions::Empty,
 mSvcHandle,
 mCharHandle,
 newCharValue);

The GATT service is created based on CustomGATTSvcClient example.
The characteristic properties are READ, WRITE, NOTIFY.
The characteristic value is written after the handles are successfully assigned from post and get callback.

bluetooth bluetooth-lowenergy gatt movesense

share|improve this question

asked Mar 22 at 17:19

HenrixHenrix

337

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  What BLE stack? Firmware? Hardware? Is the code you added is a snippet from your firmware or client? Most firmware implementations I saw have separate API calls: one to update the characteristic's value and another to trigger a notification - see if that is the case.
  
  – bavaza
  Mar 24 at 8:23
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If you use an app such as nRF connect, do you receive the notification there? And maybe you need to subscribe the characteristics first. In nRF connect there is a button for this also, so you can try out there.
  
  – maze
  Mar 27 at 9:20
  

  
  
  
  

add a comment | 

I'm trying to notify a GATT characteristic where an external BLE GATT client has registered to (pure BLE / no mobile device lib). I can successfully register for notify with my external GATT client (running on a microcontroller). However, when updating the characteristic on Movesense, no notify event seems to arrive at GATT client.
The characteristic value is written in notify callback, when new sensor data is available via asyncPut():

WB_RES::Characteristic newCharValue;
...
asyncPut(WB_RES::LOCAL::COMM_BLE_GATTSVC_SVCHANDLE_CHARHANDLE(),
 AsyncRequestOptions::Empty,
 mSvcHandle,
 mCharHandle,
 newCharValue);

The GATT service is created based on CustomGATTSvcClient example.
The characteristic properties are READ, WRITE, NOTIFY.
The characteristic value is written after the handles are successfully assigned from post and get callback.

bluetooth bluetooth-lowenergy gatt movesense

share|improve this question

asked Mar 22 at 17:19

HenrixHenrix

337

WB_RES::Characteristic newCharValue;
...
asyncPut(WB_RES::LOCAL::COMM_BLE_GATTSVC_SVCHANDLE_CHARHANDLE(),
 AsyncRequestOptions::Empty,
 mSvcHandle,
 mCharHandle,
 newCharValue);

share|improve this question

asked Mar 22 at 17:19

HenrixHenrix

337

share|improve this question

asked Mar 22 at 17:19

HenrixHenrix

337

asked Mar 22 at 17:19

HenrixHenrix

337

asked Mar 22 at 17:19

HenrixHenrix

337