Passing a IP address to a comp when loading.

Halcompile has a limited ability to accept custom modparams, however it only really handles ints:

github.com/LinuxCNC/linuxcnc/blob/master...ls/halcompile.g#L116

It would be cool to expand it to handle MP_ARRAY_STRING (for example) but at the moment the solution is to use "dummy" and then handle it in the code.

For an example that passes an array of strings:
github.com/LinuxCNC/linuxcnc/blob/2e75b0...ponents/message.comp

(very) limited docs: linuxcnc.org/docs/2.8/html/man/man3/RTAP...Y_STRING.3rtapi.html

You use "modparam dummy" purely to document it, in practice the RTAPI_MP..... does all the work, basically declaring and populating a global variable.

BeagleBrainz wrote:

Is it ok to use socket functions in the EXTRA_SETUP, from memory there is a function I can use to validate that the address is good. I'll have to check my socket programming book.

I am not sure. Does it work?

I am actually wondering if anything using IP is going to work in a realtime component. Maybe this needs to be a userspace component anyway?