2-bit correction with --fix --fix in dump1090-fa 3.8

[caius]

@obj

By default these 2-bit-corrected messages will not be emitted to any network clients. If you do want to pass them on, then either the client should enable verbatim mode on that connection (this requires changes to the client) or you can pass the --net-verbatim option to turn on verbatim mode for all connections. In verbatim mode, the original uncorrected message is sent to the network - the downstream client is then responsible for applying error correction if desired. So either way, there’s probably some work needed in other software if you want it to handle these messages.

The flightradar24 client is definitely not aware of net-verbatim, since they emailed me to enquire if I was actually receiving 50,000 aircraft per day. On investigating I found that their client does not do error correction or checking on received messages, so the list of aircraft fills up with junk. Best leave it disabled until they update their client (if they ever do) to be aware of it if you feed them as well. I did tell them about it, so the ball is in their court.

[tech0]

The automatic update to Dump1090 3.8.0 replaced graphs.js with no option to keep the current file. The update process allowed me to keep the current dump1090-fa configuration file. At least there should be a warning that some configuration files will be replaced.

[foxhunter]

meanwhile officially announced:

Announcing PiAware 3.8.1!

Latest version is 3.8.1, released on March 25th, 2020. Instructions and Download Links FlightAware is proud to announce the launch of PiAware 3.8.0! This version provides support for the Raspberry Pi 4. Major release highlights: Buster support; sdcard image is now based on Buster; Pi 4 support. Changes to handling of noisy data; additional messages are required before aircraft are considered to be reliably tracked. This will affect site statistics (notably “Other” aircraft counts) for some…

[wiedehopf]

@caius

Best leave it disabled until they update their client (if they ever do) to be aware of it if you feed them as well. I did tell them about it, so the ball is in their court.

As i understood you just use --fix --fix to fix 2 bit errors coming from the airspy set to verbatim.

FR24 and others won’t get those 2 bit corrected messages.
piaware/faup1090 will request net-verbatim and only correct the 1 bit errors.

That’s if i understood correctly.

[abcd567]

I feel lucky that I dont have any fancy dongle like Air Spy. No headaches for 2-bit, verbatim, --fix etc etc

[caius]

@wiedehopf

As i understood you just use --fix --fix to fix 2 bit errors coming from the airspy set to verbatim.

FR24 and others won’t get those 2 bit corrected messages.
piaware/faup1090 will request net-verbatim and only correct the 1 bit errors.

Yep that seems correct - FR24 client isn’t going nuts with that set.

[obj]

Yeah, that’s the plan. Trying to break as few other things as possible here

[Patrius]

@nicolasguiral

I have seen in the changelog that now we can use the 2 bits corrected messages, that’s great, but how do that, where to put the --net-verbatim option ?

I read the changelog.
Has anybody a link to a “technical” page where all those terms are explained or placed in a context I can better understand
My knowledge about antennas and electronic stuff is none to zero…
Thank you