PR #152 issues

[W0CHP]

The calibration page requires lsof being present on Pi-Star, which by default, is not. E.g.:

https://github.com/AndyTaylorTweet/Pi-Star_DV_Dash/blob/03afc6b71e191de7dc41e09db92e58b92a0e9664/admin/calibration.php#L16

Additionally, the calibration page's call to netcat (nc) is using the -w0 flag in three instances, resulting in a "invalid wait-time" output. Pi-Star ships with netcat-traditional/oldstable,now 1.10-41.1 , so I'm unsure if the PR creator's @narspt nc version is different and honors the -w0 flag. 🤷 E.g.:

https://github.com/AndyTaylorTweet/Pi-Star_DV_Dash/blob/03afc6b71e191de7dc41e09db92e58b92a0e9664/admin/calibration.php#L30

Ultimately, the calibration page does not work as described in the PR #152 notes (no green indicator after "start" is invoked, unable to select modes) on a pristine Pi-Star 4.1.6 installation.

[MW0MWZ]

@narspt - if there are requirements to make this work, let me know and I can push an update to pull them in.

[narspt]

Thanks @W0CHP for pointing this, I did just submit a PR to fix the issues. Indeed somehow I have nc.openbsd as default instead of nc.traditional on my Pi-Star, and I do have lsof ... I should have tested it on a clean Pi-Star, sorry.

@MW0MWZ: No need to include anything extra, I did just change it on new PR to use fuser -k instead of kill/lsof and changed nc arguments ensuring compatibility with both flavors of nc, actually only for the listen nc because for sending udp data I did even better and changed it to native php code, cleaner and faster 😄

[W0CHP]

No worries, @narspt. Good woork - PR #162 now functions as described on a default Pi-Star 4.1.6 installation. :-)

[W0CHP]

Verified that PR #162 addressed this issue. Thank you @narspt :)