ble_db_discovery_start () returns NRF_ERROR_INVALID_PARAM (0x7)
This problem occurs when two peripherals are connected to one central unit.
The two peripherals use the same UUID.
step-by-step
1. Connect the A peripheral to Central.
2. Connect the B peripheral to Central.
3. The connection with the A Peripheral is broken for some reason.
4. Connect to the A peripheral again.
3. If ble_db_discovery_start () is executed after connection, error value 0x7 is returned.
ble_db_discovery_start() argument
> conn_handle
Pass p_ble_evt-> evt.gap_evt.conn_handle of BLE_GAP_EVT_CONNECTED event.
> p_db_discovery
Declare BLE_DB_DISCOVERY_ARRAY_DEF (m_db_disc, CONNECT_PERI_MAX) and pass the following:
m_db_disc [p_ble_evt-> evt.gap_evt.conn_handle]
* Just before passing m_db_disc as an argument, the following processing is performed to delete the remaining data.
m_db_disc [p_ble_evt-> evt.gap_evt.conn_handle] .discovery_in_progress = 0;
m_db_disc [p_ble_evt-> evt.gap_evt.conn_handle] .discovery_pending = 0;
m_db_disc [p_ble_evt-> evt.gap_evt.conn_handle] .conn_handle = BLE_CONN_HANDLE_INVALID;
