send data fail using ble_nus_data_send

[paul0208]

Hi,

I am using nus service to send and receive data between Android App.

After connection established, App send some data to my module and ble_evt_handler get that data well.

And to send reply message to App, I call the ble_nus_data_send directly at the ble_evt_handler, but error is returned, 8.

I moved the code into the bsp_event_handler on the case of BSP_EVENT_KEY_0, but same error code is occur when pressed key 0.

Help me

BR

Paul

[Vidar Berg]

Hi,

Error 8 corresponds to NRF_ERROR_INVALID_STATE and will be returned if one of the following conditions are true:

 - Invalid Connection State
 - Notifications and/or indications not enabled in the CCCD
 - An ATT_MTU exchange is ongoing

Please verify that the android app enabling notifications for this characteristic.  

Best regards,

Vidar

[paul0208]

I am using "nRF Toolbox for BLE" APP from you

My source is from ble_app_uart example.

[Vidar Berg]

Are you passing m_conn_handle to ble_nus_data_send(), and what is the value does the connection handle have when you get the error?

[paul0208]

It was my mistake.

I did separate nus/uart handler to another file.

But BLE_NUS_DEF(m_nus, NRF_SDH_BLE_TOTAL_LINK_COUNT); was included in both file.