data_length_update error in pc-ble-driver-py

Question

Hi, 
 I have met an error which occurs in: 
 self.adapter.data_length_update(new_conn, 251) 
 The error code is as followed: 
 pc_ble_driver_py.exceptions.NordicSemiException: Failed to ble_gap_data_length_update. Error code: NRF_ERROR_RESOURCES 
 
 Has anyone experienced similar problems?

Sigurd · Accepted Answer

Hi, 
 You will get NRF_ERROR_RESOURCES returned from the call to sd_ble_gap_data_length_update() if the connection event length is not long enough. So you must increase the event length first. See API doc snippet for sd_ble_gap_data_length_update(): 
 * @retval ::NRF_ERROR_RESOURCES The connection event length configured for this link is not sufficient for the requested parameters.
 * Use @ref sd_ble_cfg_set with @ref BLE_CONN_CFG_GAP to increase the connection event length.
 * Inspect p_dl_limitation to see where the limitation is. 
 pc-ble-driver-py example snippet: 
 gap_cfg = BLEConfigConnGap()
 gap_cfg.conn_count = 1
 gap_cfg.event_length = 5

self.adapter.driver.ble_cfg_set(BLEConfig.conn_gap, gap_cfg)

data_length_update error in pc-ble-driver-py

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