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I just got off the phone with 3DR today and 3DR confirmed a known telemetry bug in Mission planner today. This is the issue I told them I am having.

First off I would like to clarify a few things.

 My testing included two computers.

1st PC is a Panasonic tough-book running XP pro.

2nd PC is a Asus   running Widows 7 PROFESSIONAL.

First and foremost both PC's have a fresh copy of there operating system installed and updated and then I re-installed MP from the Website. 

This is what happens.

Test #1

Connected Pixhawk to MP using USB cable and planned out simple 12 way-point mission. The mission included,,  take off,, way-points, , region of interest, ,, and finally RTH..

Wrote the mission to PH and then read it back several times in a row and it is flawless as it should be.

Nothing at all changed and again it reads  back perfectly as it should using USB.

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Test #2

Now with that mission still in the PH.

I unplugged the USB connection and regained connection using 3DR telemetry radios. 

I read back the mission several times and every time i read it back something changed. I ended up with two (take off) lines of commands and my RTH disappeared completely and never came back and my ROI command would Change command lines.

Now I unplugged the 3DR radios and again plugged in the USB connection. I again connected MP to PH to see if the mission was that messed up.

When I read back the planned mission using the USB connection everything was normal and it was the original mission to the T. and my RTH command line returned also.

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 Test #3

Well hold on if you think it is a 3DR radio issue. .

So next, I installed APM planner 2.0 on my Windows 7 Pro PC,  and my XP PC.

Since APM and MP are a little different as to the features  I deleted the existing mission from Pixhawk and setup another mission in APM 2.0. 

I planned a mission in APM 2.0 and written it to PH using USB connection.  

I then read it back several times and again I had ""ZERO"" issues it was perfect every time using the USB connection, Just as it was with MP.

(((Are you ready for this)))

So I again regained connection with PH using the 3DR radios and read back the mission several times. the outcome ((( It was perfect and flawless using APM 2.0. )))

So it's not a 3DR telemetry radio issue. 

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Test#4

Hold on ,,,I'm not finished yet. 

So I disconnected and closed out of APM 2.0. 

I Opened MP and connected to the Pixhawk using the 3DR radios.  I read back the mission and found that it again had changed the mission command lines. .

If I read back the mission three times or so it will eventually read right..

So there is a bug. Not with the 3DR radio link but with mission planner.

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Test #5

So is it the PC running Windows 7 Professional with a fresh install? Let's find out. 

So I did the same test with a different PC, I used the Panasonic tough book running a fresh copy of windows XP and a fresh download of MP. .

I had the same outcome with the same test every time as I did with the Windows 7 operating system  

So It's not the PC'S nor is it the 3DR TELEMETRY RADIOS. 

There is something missing in the transmitted and received packets.

But what. .. 

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Test #6

I planned out a large mission and wrote the mission to the PH using the 3DR telemetry radio. Once written I disconnect the telemetry radios and read the mission back using USB connection.

I found that writing the mission to the PH with the telemetry radios works fine but again reading it back using the telemetry radios is a disaster. Once again I connected the USB and read back the mission and it was just fine.

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SO this is what I know,

Two different PC'S running two different operating systems and the same programs and having the same issue with that program(( MP )).

Found NO read or write issues using telemetry radios with APM planner on either XP or Win 7 PC's

I wanted to run the same test using Droid planner and MP but I had found that Droid planner and Mission planner Don't play well together. I had found that some of the flight modes are not recognized from one to the other so there could be no testing done..

SO there you have it.

Why does this happen in Mission Planner and NOT in APM planner? whats missing?

What is the fix for this?

 Michael Oborne If you are reading this could you please help.

Thank you