BATC Forum

Posted: **Wed Sep 24, 2025 3:19 pm**

Hi

I'm investigating whether I can update the Portsdown to support transmissions from the LibreSDR with tezuka firmware. I seem to have hit a block, but must be doing something wrong:

The LibreSDR is flashed with tezuka-0.1.9; the attached screenshot from the Windows MQTT explorer shows that this is functioning.

I then plug the LibreSDR into a Raspberry Pi with mosquitto software loaded, and send the command:

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mosquitto_pub -t 'cmd/pluto/system/call' -m g8gkq -h 192.168.5.1

Note that I have modified config.txt to put my Pluto at 192.168.5.1 to avoid a conflict with my main LAN.

I can then run

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pi@raspberrypi:~ $ mosquitto_sub -t "state/tx/frequency"  -h 192.168.5.1
2450000000
2450000000

which successfully returns the default frequency.

My problem is that I cannot change that frequency or any of the other parameters. The command that I am using is:

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mosquitto_pub -t 'cmd/pluto/g8gkq/tx/frequency' -m 437000000 -h 192.168.5.1

but it has no effect.

Can anyone tell me what I am doing wrong?

Thanks

Dave, G8GKQ

Posted: **Wed Sep 24, 2025 4:00 pm**

Can't you just treat it as a Pluto and use that API instead? (libiio)

Posted: **Wed Sep 24, 2025 4:03 pm**

No, because the Portsdown software used Evariste's old onboard rtmp to DVB encoder in the old Pluto software that is not included in the any of the recent builds.

Dave

Posted: **Wed Sep 24, 2025 4:05 pm**

Ah, I see. Sorry.

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