utility.go

package engcore_modbus

import (
	"encoding/binary"
	"fmt"
	"log"
)

//First register offset
func GetOffset(data []byte) uint16 {
	return binary.BigEndian.Uint16(data[:2])
}

//Count of register
func GetLength(data []byte) uint16 {
	return binary.BigEndian.Uint16(data[2:4])
}

//Count of data bytes
func GetByteCount(data []byte) uint16 {
	result := make([]byte, 2)
	result[0] = 0
	result[1] = data[4]
	return binary.BigEndian.Uint16(result)
}

//Check offset and name length
func ValidateSetNameData(offset int, name string) error {
	if offset > 65535 {
		return fmt.Errorf("coil outside")
	}
	if len(name) == 0 {
		return fmt.Errorf("empty name")
	}
	return nil
}

//data []byte - is modbus data without offset and length
func ByteSliceToUintSlise(data []byte) []uint16 {
	var result []uint16
	log.Printf("ByteSliceToUintSlice function get data: %v", data)
	for i := 0; i < len(data); i += 2 {
		log.Println(i)
		temp := make([]uint16, 1)
		temp[0] = binary.BigEndian.Uint16(data[i : i+2])
		log.Printf("converted data is: %v", temp[0])
		result = append(result, temp[0])
	}
	return result
}