package protocol

type MessageKey = uint16

const (
	MessageKeyHeartbeat   MessageKey = 0xffff // MessageKeyHeartbeat heartbeat message
	MessageKeyEmit        MessageKey = iota   // MessageKeyEmit Emit request, no response
	MessageKeyAckRequest                      // MessageKeyAckRequest Emit request, wait for response (ack)
	MessageKeyAckResponse                     // MessageKeyAckResponse ack response
)