IFD XP Trainer Issues

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   I have been trying to characterize the issues with using the XP trainer flying ILS approaches in xPlane.
I believe this is related to the ILS issue that Ricardo documented here. here: http://avidynelive.com/workaround-for-ifd-xp-trainer-ap-bug_topic2444.html
This seems to only occur if you activate an ILS approach while in GPS mode. and then  switch the nav source to NAV.
I have identified that the trainer is sending erroneous CDI errors (number of dots off) to the instruments. Using a network analyzer I have discovered that the trainer is sending these two xrefs with the wrong values. 
sim/cockpit/radios/nav1_hdef_dot
sim/cockpit/radios/nav1_vdef_dot

xPlane tries to correct them which causes the needles to fight as shown in the video linked here: https://drive.google.com/file/d/1PPTHkWlv2ilY0QhXWoUGoLz73dnVuXZy/view?usp=sharing
At the end of the video when the needles calm down it is because I killed the Avidyne app on the iPad.
If the approach is activated while nav source is selected to NAV this issue does not occur.

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jwalton49 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 11 Sep 2018 Location: TEXAS Status: Offline Points: 27	Post Options Post Reply Quote jwalton49 Report Post Thanks(0) Quote Reply Topic: IFD XP Trainer Issues Posted: 02 Jan 2023 at 12:55pm
	I have been trying to characterize the issues with using the XP trainer flying ILS approaches in xPlane. I believe this is related to the ILS issue that Ricardo documented here. here: http://avidynelive.com/workaround-for-ifd-xp-trainer-ap-bug_topic2444.html This seems to only occur if you activate an ILS approach while in GPS mode. and then switch the nav source to NAV. I have identified that the trainer is sending erroneous CDI errors (number of dots off) to the instruments. Using a network analyzer I have discovered that the trainer is sending these two xrefs with the wrong values. sim/cockpit/radios/nav1_hdef_dot sim/cockpit/radios/nav1_vdef_dot xPlane tries to correct them which causes the needles to fight as shown in the video linked here: https://drive.google.com/file/d/1PPTHkWlv2ilY0QhXWoUGoLz73dnVuXZy/view?usp=sharing At the end of the video when the needles calm down it is because I killed the Avidyne app on the iPad. If the approach is activated while nav source is selected to NAV this issue does not occur.

vancinad Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 23 Sep 2018 Location: USA Status: Offline Points: 60	Post Options Post Reply Quote vancinad Report Post Thanks(0) Quote Reply Posted: 15 Feb 2023 at 2:31pm
	What network analyzer are you using? I have been interested in doing some of this investigation myself but haven't found a suitable tool. (Where "suitable" includes "very inexpensive"!)

ricardo Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 17 Jan 2022 Location: Seattle, wa Status: Offline Points: 133	Post Options Post Reply Quote ricardo Report Post Thanks(1) Quote Reply Posted: 15 Feb 2023 at 3:30pm
	i used WireShark

jwalton49 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 11 Sep 2018 Location: TEXAS Status: Offline Points: 27	Post Options Post Reply Quote jwalton49 Report Post Thanks(1) Quote Reply Posted: 15 Feb 2023 at 8:37pm
	https://www.wireshark.org/ for me as well.