Raspberry Pi 4 released!

[MatsA]

Yes it was done some time ago. In OpenPlotter 2 is possible to get data from both AIS channels simultaneously using only one device. But at this moment only in Raspberry 3.
The commit you are referring to is the fix for gqrx for buster (SDR Radio reception)

Hello, Saillog, 
I have already worked with AISDeco2 (http://xdeco.org/?page_id=30#ai2_id=30#ai2) in the last OP versions. It always worked very well and can also receive signals on 2 channels. 
I just tested the program with a RPI3+ and Buster. 
It seems to work. I just had to install the required packages and then it worked. 
Unfortunately I am not able to test it with real ships at the moment. 

Is this an option?
Greetings Jürgen

It could be an option but we use https://github.com/sailoog/rtl-ais and aisdecoder and it is already working really well.

Checked aisdeco2 and it doesn't work on RPi 4, and is not open source !! Error "rtlsdr_read_reg failed with -7".

that is the error on RPI4 using SDR devices. No matter what soft you use.

Yes that right, but it seems to be solved, but not yet merged.
https://github.com/raspberrypi/linux/issues/3060
Heads up for compiling rtl-ais. Check https://github.com/dgiardini/rtl-ais/pull/15
/Mats