Send Delayed Response to Bluetooth Read / Write Request

[Andreas Poppe]

Hello Community,

this is my first question, since I could not find any clue on the internet and here on the devzone.

Problem:

I need to read/write a value to a GATT characteristics server which is then forwarded to a I2C. The I2C device is responding and I want to send the response to the client afterwards.

Do you have a clue how to solve this? I tried using the read/write authorization, but it forces me to send an immediate response

What am I doing wrong? Any ideas welcome?

Best regards

Andreas

[Edvin]

Hello Andreas,

You do not have to answer this at once. You can wait for the response from your I2C device before sending the confirmation.

You can see in this message sequence chart how to treat the BLE_GATTC_EVT_HVX. It does not say, but you can wait (for a reasonable amount of time). You just have to make sure that you use the correct conn_handle and handle when you use the sd_ble_gattc_hv_confirm() function, once you have received your response from the I2C device.

Best regards,

Edvin

[Andreas Poppe]

Hello,

thanks for the repley. 

I found the problem, it was within my software.

The BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST is called on each read / write and then my code accidently answered via the sd_ble_gatts_rw_authorize_reply  call immediatly. It was not supposed to. 

I fixed it by not calling sd_ble_gatts_rw_authorize_reply  immediatly, but from another function later after reading/writeing the data to the I2C device.

regards

Andreas