Function pamoja_modbus_frame_function 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn pamoja_modbus_frame_function(
    frame: *const PamojaModbusFrame,
) -> u8

Returns a frame’s function code.

An exception response carries the request’s function code with its high bit set, so this returns that byte as it appeared on the wire.

Returns

The function code, or 0 if frame is null.

Safety

frame must be a live handle from pamoja_modbus_frame_parse, or null.