ble_l2cap_ch_rx_params_t

        The maximum L2CAP PDU payload size, in bytes, that L2CAP shall be

able to receive on this L2CAP channel.

• Must be equal to or greater than BLE_L2CAP_MPS_MIN .
• Must be equal to or less than ble_l2cap_conn_cfg_t::rx_mps .

        The maximum L2CAP SDU size, in bytes, that L2CAP shall be able to

receive on this L2CAP channel.

• Must be equal to or greater than BLE_L2CAP_MTU_MIN .

       SDU data buffer for reception.

• If ble_data_t::p_data is non-NULL, initial credits are issued to the peer.
• If ble_data_t::p_data is NULL, no initial credits are issued to the peer.