first init

transport.go

@@ -0,0 +1,18 @@
+package modbus
+
+type transportType uint
+const (
+	modbusRTU        transportType   = 1
+	modbusRTUOverTCP transportType   = 2
+	modbusRTUOverUDP transportType   = 3
+	modbusTCP        transportType   = 4
+	modbusTCPOverTLS transportType   = 5
+	modbusTCPOverUDP transportType   = 6
+)
+
+type transport interface {
+	Close()              (error)
+	ExecuteRequest(*pdu) (*pdu, error)
+	ReadRequest()        (*pdu, error)
+	WriteResponse(*pdu)  (error)
+}