[GreenKeys] Looking for Alternative Method of Receiving Internet Broadcast of TTY Modem Tones

Sat Oct 3 19:32:04 EDT 2026

I've been working on an http client for my DSP TU wifi module (
https://w6iwi.org/rtty/DspTU3/ ). I keep getting distracted onto other
projects.

http://plaintext.w6iwi.org/rtty/audio/npr/audio/60wpm/latestt.php

has audio as a single PCM wav file with 8 bits per sample and 8 k samples
per second so there is no need to deal with MP3 decoding. It is also http
instead of https, so you don't have to deal with encryption.

Note that latestt is spelled with two t s at the end. If you do it with a
single t, an HTTP redirect is sent, which then sends the browser to the
latest file. latestt.php directly sends the latest audio with no redirect
making the http client simpler.

My DSP TU is using the PIC32MZ. I have not used the ESP32, but I find some
stuff on using it for this application at
https://share.google/aimode/0mgzuvHV82SFKFqn8 .

Good luck!

Harold
https://w6iwi.org

On Sat, October 3, 2026 11:31 am, William Wuttke via GreenKeys wrote:
> It's definitely doable. I've written an app to do just that. The ESP32 is
> a very powerful device. Bill
> KE3BK
>
>
> On Sat, Oct 3, 2026 at 8:51â€¯AM Paul Newland, ad7i via GreenKeys <
> greenkeys at mailman.qth.net> wrote:
>
>> I'm looking for some help to fill in my knowledge gap(s), and see if I
>> can find a lower cost way of receiving internet broadcasts of TTY tones.
>>
>>
>> My current setup to drive my Model 28RO consists of a Raspberry Pi 3B
>> which is connected to my home WiFi network.  Connected to the Pi is a
>> cheap ($3) USB sound card dongle. I run the Pi headless and control the
>> Pi from
>> my primary W11 PC using VNC over my home network.  In order to play TTY
>> modem tones from the Pi, on the Pi I open the Chrome web browser and
>> connect to one of the various internet TTY sources (ITTY, W6IWI, etc).
>> This brings up a small window with audio player controls on the
>> W11/VNC/Pi
>> display monitor.  I click the play button, adjust the Pi's speaker
>> volume output for max (because bigger is better) and the  audio modem
>> tones appear at the headphone output of the attached USB Sound Card
>> dongle, which is connected to a HAL ST-5000 (and the 28RO).  And with
>> that setup complete I get modem tones for days and days, which is just
>> what I want.
>>
>> The problem is that Raspberry Pis have now become "unobtainium", at
>> least at a reasonable price.  Data Centers have sucked up all the RAM
>> mfg capacity so that RPi can't get ram at a reasonable price to make
>> more Pis. So I'm now looking for alternatives to the Pi (because I want
>> to repurpose my now scarce R-Pi to something other than internet RTTY).
>>
>> So, for potential alternatives, I note that the ESP32-S3 can connect
>> via WiFi to the internet.  It also supports a USB port that can be
>> configured as On The Go (OTG) which makes me think that it might support
>> a USB sound dongle.  The ESP32-S3 seems to have great availability and
>> is priced at less than $6 delivered to my front door.
>>
>> So my question to the TTY-Internet cognoscenti is: can the ESP32-S3 go
>> out onto the internet, connect to an ITTY-like website, ask for that
>> website to send it packets of audio data that represent TTY modem tones
>> and have those tones be reproduced by the USB-sound dongle?  In a
>> perfect world I'd like to configure the ESP32-S3 so that every time it
>> powers up it should go to that ITTY-like website and cause modem tones
>> to be generated by the sound dongle, without any user intervention.
>> Does anyone know if this is
>> possible and if so can you provide me with any pointers that would help
>> me to implement this functionality.
>>
>> Thanks,
>>
>>
>> Paul, ad7i
>>
>>
>>
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>>
>>>>> Jordan Spencer Cunningham's GreenKeys Search Tool:
>>>>>
>> https://teletype.net/gksearch
>>
>>>>> 2002-to-present greenkeys archive:
>>>>>
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>>
>>>>> 1998-to-2001 greenkeys archive:
>>>>>
>> http://mailman.qth.net/archive/greenkeys/greenkeys.html
>>
>>>>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
>>>>>
>> http://comcents.com/tty/greenkeyssearch.html
>>
>>
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> ______________________________________________________________
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>
>
>>>> Jordan Spencer Cunningham's GreenKeys Search Tool:
>>>> https://teletype.net/gksearch
>>>> 2002-to-present greenkeys archive:
>>>> http://mailman.qth.net/pipermail/greenkeys/
>>>> 1998-to-2001 greenkeys archive:
>>>> http://mailman.qth.net/archive/greenkeys/greenkeys.html
>>>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
>>>> http://comcents.com/tty/greenkeyssearch.html
>>>>
>
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