modbus_get_byte_from_bits - get the value from many bits

       The libmodbus documentation was written by Stéphane Raimbault <stephane.raimbault@gmail.com>

libmodbus v3.1.6                                   12/09/2019                            MODBUS_GET_BYTE_FROM(3)

       The modbus_get_byte_from_bits() function shall extract a value from many bits. All nb_bits bits from src
       at position index will be read as a single value. To obtain a full byte, set nb_bits to 8.

       modbus_get_byte_from_bits - get the value from many bits

       The function shall return a byte containing the bits read.

modbus_set_bits_from_byte(3) modbus_set_bits_from_bytes(3)

uint8_tmodbus_get_byte_from_bits(constuint8_t*src,intindex,unsignedintnb_bits);