modbus_get_float - get a float value from 2 registers
float modbus_get_float(const uint16_t *src);
Warning, this function is deprecated since libmodbus v3.2.0 and has been replaced by modbus_get_float_dcba().
The modbus_get_float() function shall get a float from 4 bytes in Modbus
format (DCBA byte order). The src
array must be a pointer on two 16 bits
values, for example, if the first word is set to 0x4465 and the second to
0x229a, the float value will be 916.540649.
The function shall return a float.