[GreenKeys] ITTY to real Teletype

Fri Nov 15 07:57:58 EST 2024

 record and examine the stream at the point where it dies?
    On Friday, November 15, 2024 at 07:55:38 AM EST, Rob Jarratt via GreenKeys <greenkeys at mailman.qth.net> wrote:  

Hello Paul,

It is fair to say that I will end up using the autostart feed rather than ITTY, but my sense of tidiness tells me that I would like to understand why ITTY kills curl stone dead, and I may want to use ITTY from time to time.

I think it would be good to fix this if the solution is easy to find and fix because others might have similar issues in future and not understand what is going on.

Thanks

Rob

From: greenkeys-bounces at mailman.qth.net <greenkeys-bounces at mailman.qth.net> On Behalf Of Paul Heller via GreenKeys
Sent: 15 November 2024 11:26
To: rob at jarratt.me.uk
Cc: Mailing List Green Keys <GreenKeys at mailman.qth.net>
Subject: Re: [GreenKeys] ITTY to real Teletype

Hi Rob. I stopped looking because I thought you went another direction. I guess I was wrong about that?  

I’ll start looking into it. 

Paul

On Nov 14, 2024, at 9:06 PM, Rob Jarratt <robert.jarratt at ntlworld.com> wrote:

Hello Paul,

I was just wondering if you ever got to look at this issue with ITTY killing curl while the Europe channel doesn’t?

Thanks

Rob

From: Paul Heller <paul0926 at comcast.net> 
Sent: 10 November 2024 14:40
To: rob at jarratt.me.uk; Rob Jarratt <robert.jarratt at ntlworld.com>
Cc: Hugh Pyle <hughpyle at gmail.com>; Jeffrey Golas <jeffg at junknet.net>; Mailing List Green Keys <GreenKeys at mailman.qth.net>
Subject: Re: [GreenKeys] ITTY to real Teletype

That is strange that the Europe channel is ok and the ITTY channel is not. I’d like to resolve this. 

The ITTY channels each have a footer transmission after the main transmission. Maybe the footers are different. I will look into this later today. 

Paul
W2TTY

On Nov 10, 2024, at 1:52 PM, Rob Jarratt via GreenKeys <greenkeys at mailman.qth.net> wrote:

I have been trying these suggestions using curl to receive ITTY and pipe it through lame and minimodem. It works well.

However, I didn’t like that curl exits after every message. So, I thought I would try to write my own code that keeps going, using libcurl, which is what curl is built from.

I discovered though that the ITTY feed does something strange and it causes curl (and libcurl) to just silently exit at the end of a message. It never reaches my cleanup code, it just dies. I thought it was a problem with my code, but I don’t think it is, there is something specifically wrong with http://internet-tty.net:8000/ITTY that cause curl to die. I have been trying to work it out but have not found the issue yet. Is anyone aware of anything peculiar about the ITTY feed? It doesn’t seem to happen for the EUROPE feed, I am not sure yet about AUTOSTART and it is able to repeatedly download other URLs (www.example.com for example).

Thanks

Rob

From: greenkeys-bounces at mailman.qth.net <greenkeys-bounces at mailman.qth.net> On Behalf Of Hugh Pyle
Sent: 07 October 2024 20:06
To: Jeffrey Golas <jeffg at junknet.net>
Cc: Mailing List Green Keys <GreenKeys at mailman.qth.net>; rob at jarratt.me.uk
Subject: Re: [GreenKeys] ITTY to real Teletype

Here are some aliases, which combine 'curl', 'lame' and 'minimodem'.   I haven't run these unattended for a while, and I seem to remember there are dropout situations that will break them easily - so you could then wrap everything in a loop if necessary.  But they might make a good starting point for you.

alias autostart='curl -N -s http://internet-tty.net:8030/AUTOSTART | lame --decode --quiet --mp3input - - | minimodem rtty -i -a -q -R 11025 -f -'
alias europe='curl -N -s internet-tty.net:8040/EUROPE | lame --decode --quiet --mp3input - - | minimodem 50 -M 1275 -S 1445 -5 -i -a -q -R 11025 -f -'
alias itty='curl -N -s http://internet-tty.net:8000/ITTY | lame --decode --quiet --mp3input - - | minimodem rtty -i -a -q --rx-one -R 11025 -f -'

Hugh

On Sun, Oct 6, 2024 at 10:15 AM Jeffrey Golas <jeffg at junknet.net> wrote:

Vlc to get the stream, minimodem to decode.

Jeff

> On Oct 6, 2024, at 3:18 AM, Rob Jarratt <robert.jarratt at ntlworld.com> wrote:
> 
> Hello,
> 
> Dave was asking this on my behalf, probably unaware that I am on this list too.
> 
> I have seen mention of ITTY Autostart etc and wondered about receiving all this on my ASR 33.
> 
> My thought was to see if I could set up a Raspberry Pi to receive the audio signal over the internet, translate that to ASCII and then send it to my ASR33. I already have the means to connect my ASR33 from software running on a Raspberry PI or a PC via reverse Telnet. The bit I am missing is what software (if any) there might be that I could run on a Raspberry Pi, or Windows that runs in the background (no GUI) to decode the ITTY audio signal. I am a software developer though, so I guess if such a thing doesn't exist then perhaps I can modify the MMTTY code that is published on GitHub.
> 
> Any pointers would be welcome.
> 
> Thanks
> 
> Rob
> 
>> -----Original Message-----
>> From: greenkeys-bounces at mailman.qth.net <greenkeys-
>> bounces at mailman.qth.net> On Behalf Of Jeffrey Golas
>> Sent: 06 October 2024 05:30
>> To: David Wade <dave.g4ugm at gmail.com>
>> Cc: Mailing List Green Keys <GreenKeys at mailman.qth.net>
>> Subject: Re: [GreenKeys] ITTY to real Teletype
>> 
>> Normally the ITTY service is fed to a piece of hardware called a terminal unit
>> (think modem). The service is streaming as RTTY which is normally sent over
>> amateur radio.
>> 
>> 
>> Jeff
>> 
>>>> On Oct 5, 2024, at 5:34 PM, David Wade <dave.g4ugm at gmail.com> wrote:
>>> 
>>> I know there have been several USB to TTY boards produced, but what
>> software would you use to drive one of these from itty?
>>> 
>>> Dave
>>> 
>>> G4UGM
>>> 
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