[Allstar Digital] Off topic

[Mike Zingman]

I am an iPhone and Android developer.  There are issues on the iPhone
side.  This all requires the ThumbDV.  Apple requires any hardware
connected to the iPhone be approved by the MFI (Made For iPhone) program.
This is an exclusive club and is not something easily done (I have already
have apps in the store with MFI approval).

Android is far easier, but still presents some challenges.  For one, you
would need an Android device that supports USB OTG.  Not too bad as many
(if not most) modern Android devices now support it.  Second you would need
Android FTDI drivers.  FTDI does in fact support Android, but in pure
java.  I have concerns that a pure Java solution on a small device would be
able to keep up with the frame rate.

Now some alternatives:
- ASL.  There is already iaxRPT apps for Android and Zoiper for iOS that
can help you connect to ASL.  Once connected you can use USRP and
DMRGateway to bridge the gap.
- Wifi.  Remote the ThumbDV with AMBEServer and use it that way.  It works
for DMRGateway already so I see no issues from a mobile device.



On Wed, Feb 10, 2016 at 10:56 AM, Robert Newberry <N1XBM at amsat.org> wrote:

> Real cool, I do not know how to write code or software, but it seems that
> it's not hard to imagine an iPhone or Android app connected to dmrlink as a
> peer...or something similar along those lines such as iaxrpt app.
>
> If I understand things right, there is a guy on YouTube by the name of
> Budd Churchward who did something similar.
>
> N1XBM
> Apparare Scientor
> Paratus Communicare
> Allstar Node # 27086, 41540, 41812, 42086, 42658
>
> On Feb 10, 2016 10:43 AM, "Mike Zingman" <mike.zingman at gmail.com> wrote:
>
>> Since this is an ASL list, this is off topic, but may interest some
>> members.  So here goes.
>>
>> Yesterday I decided to try a simple experiment and it worked better than
>> I had expected.  I conducted my first QSO on DMR without any RF hardware at
>> all.  Basically just like the DVDongle/ThumbDV for DStar is used (WinDV or
>> DummyRepeater).  It looks like:
>>
>> Mic/Speaker on PC <---> DMRGateway <---> DMRlink <--- BM or SANDBOX
>>
>> DMRGateway talks directly with the ThumbDV to both encode and decode the
>> AMBE data.  The audio and data paths look like:
>>
>> TX - Mic audio is pulled from the sound card as 8KHZ PCM and feeds the
>> encoder.  PTT is controlled by either VOX or a keyboard toggle.  The AMBE
>> is then encapsulated in IPSC frames and passed on to DMRlink to send to the
>> network.
>>
>> RX - DMRlink sends us AMBE frames.  AMBE audio is decoded by the ThumbDV
>> and the 8KHZ PCM is sent to the sound hardware.
>>
>> This is the same as the ASL solution with USRP except that there is no
>> ASL and no USRP ;-)
>>
>> And it works!  The sound is clean.
>>
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>>
>>
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