Refactor pdus into many files

pdu/bind.go

@@ -0,0 +1,44 @@
+package pdu
+
+type (
+	BIND struct {
+		PDU_HEADER
+		system_id         string
+		password          string
+		system_type       string
+		interface_version uint8
+		addr_ton          uint8
+		addr_npi          uint8
+		address_range     string
+	}
+	BIND_RESP struct {
+		PDU_HEADER
+		system_id            string
+		sc_interface_version uint8
+	}
+	BIND_RECVEIVER struct {
+		BIND
+	}
+	BIND_RECEIVER_RESP struct {
+		BIND_RESP
+	}
+	BIND_TRANSMITTER struct {
+		BIND
+	}
+	BIND_TRANSMITTER_RESP struct {
+		BIND_RESP
+	}
+	BIND_TRANSCIEVER struct {
+		BIND
+	}
+	BIND_TRANSCIEVER_RESP struct {
+		BIND_RESP
+	}
+	
+	UNBIND struct {
+		PDU_HEADER
+	}
+	UNBIND_RESP struct {
+		PDU_HEADER
+	}
+)