modbus_get_header_length(3) Manual Page

int modbus_get_header_length(modbus_t *ctx);

The modbus_get_header_length() function shall retrieve the current header length from the backend. This function is convenient to manipulate a message and so its limited to low-level operations.

The header length as integer value.

libmodbus(7)

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