modbus rtu 1.1 plugins

plugins/protocols/modbus_rtu/framer/ModbusRtuFraming.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include <cstddef>
+#include <cstdint>
+#include <optional>
+
+#include <QString>
+
+namespace softbus::message_bus::pipeline::protocol::modbusrtu
+{
+
+std::uint16_t crc16(const std::uint8_t* data, std::size_t len);
+bool crcOk(const std::uint8_t* adu, std::size_t aduLen);
+std::optional<std::size_t> predictAduLength(const std::uint8_t* buf, std::size_t len, std::size_t maxAdu);
+bool isModbusRtuHint(const QString& hint);
+
+} // namespace softbus::message_bus::pipeline::protocol::modbusrtu