AT send delay set to 0 in port probings

[Brent Sink]

> How did you apply the patches I sent? Did you "save" the emails and

> apply them with "git am"? or did you manually modify the files with
> the changes seen in the patches? I ask because the \x90\xf0 looks like
> some UTF-8 multibyte sequence that shouldn't have been there.

So it seems there were some leftover files in buildroot from an older version of ModemManager (I believe it was 1.6.2), which resulted in some of the errors I was seeing.  I have struggled getting autogen.sh to configure everything correctly for buildroot, so I had copied all of the configure and Makefile.in files from 1.6.2 into the 1.7.0 branch so that it would build correctly.  This must have caused some issues... :)  I ended up building ModemManager on the embedded device to avoid any potential cross compiling or linking issues.

I have verified that the patches are good, so you can merge them into master when you are ready.  I think I will need to add a few more AT commands so that it initializes the SARA-U260 properly, so I'll see if I can figure that out this week.  Thanks for the help!

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