func exchangeMtu()

in nmxact/nmble/ble_act.go [592:638]

39 lines of code
12 McCabe index (conditional complexity)


func exchangeMtu(x *BleXport, bl *Listener, r *BleExchangeMtuReq) (
	int, error) {

	const rspType = MSG_TYPE_EXCHANGE_MTU
	const evtType = MSG_TYPE_MTU_CHANGE_EVT

	j, err := json.Marshal(r)
	if err != nil {
		return 0, err
	}

	if err := x.Tx(j); err != nil {
		return 0, err
	}

	bhdTmoChan := bl.AfterTimeout(x.RspTimeout())
	for {
		select {
		case err := <-bl.ErrChan:
			return 0, err

		case bm := <-bl.MsgChan:
			switch msg := bm.(type) {
			case *BleExchangeMtuRsp:
				bl.Acked = true
				if msg.Status != 0 {
					return 0, StatusError(MSG_OP_RSP, rspType, msg.Status)
				}

			case *BleMtuChangeEvt:
				if msg.Status != 0 {
					return 0, StatusError(MSG_OP_EVT, evtType, msg.Status)
				} else {
					return int(msg.Mtu), nil
				}

			default:
			}

		case _, ok := <-bhdTmoChan:
			if ok {
				x.Restart("Blehostd timeout: " + MsgTypeToString(rspType))
			}
			bhdTmoChan = nil
		}
	}
}