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components/modbus/include/modbus.h

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+#ifndef MODBUS_H_
+#define MODBUS_H_
+
+#define MODBUS_PACKET_SIZE                      256
+
+#define MODBUS_READ_UINT16(buf, offset)         ((uint16_t)(buf[offset] << 8 | buf[offset + 1]))
+#define MODBUS_WRITE_UINT16(buf, offset, value) \
+    buf[offset] = value >> 8;                   \
+    buf[offset + 1] = value & 0xFF;             \
+
+#include "esp_err.h"
+
+/**
+ * @brief Initialize modbus
+ * 
+ */
+void modbus_init(void);
+
+/**
+ * @brief Process modbus request
+ * 
+ * @param buf Request/response data
+ * @param len Length of request data
+ * @return uint16_t Length of response data, 0 if no response
+ */
+uint16_t modbus_request_exec(uint8_t *buf,  uint16_t len);
+
+/**
+ * @brief Get modbus unit id
+ * 
+ * @return uint8_t 
+ */
+uint8_t modbus_get_unit_id(void);
+
+/**
+ * @brief Set modbus unit id
+ * 
+ * @param unit_id 
+ */
+esp_err_t modbus_set_unit_id(uint8_t unit_id);
+
+#endif /* MODBUS_H_ */