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

[Johannes Eggers]

You got yourself a nice project there...

The only challenge I can immediately see (and it may not be a problem), is
that you're asking it to do a stream rather than a single download.  I
think if the server is using HLS, that should be manageable.

Do you know the URL and format of the audio stream?

Where you could go REALLY fancy is this: Don't just stream it into the
ESP32 and output the audio, instead de-modulate and output a signal that
can feed straight into the  28RO





On Sat, Oct 3, 2026 at 10:51 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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