Consumer score don't change in network disconnection about mediasoup

[ibc]

What does "when the participant looses connection" exactly mean? mediasoup doesn't monitor the network status of participants other than available bandwidth but the latter doesn't conclude "endpoint is disconnected" at all.

[AlexLeoRQ]

The practical example is a room with two participants. I am referring to the case in which one of those participants loses the connection, its producer stops sending flow, in that case the consumer's score should be modified, in this specific case go from a score of 10 to a score of 0. This is how it was working

[ibc]

How is the score of the server side producer in that scenario?

[AlexLeoRQ]

I have been debugging on the server side using version 3.13.0 and 3.11.20.
In my code on the server side I have a consumer.on('score') and a producer.on('score')

I have verified that in v3.11.20 it enters both events over time when the score value is modified:

Score in consumer: { producerScore: 10, producerScores: [ 10 ], score: 10 }
Score in producer: [ { encodingIdx: 0, score: 10, ssrc: 3376637265 } ]

Score in consumer: { producerScore: 9, producerScores: [ 9 ], score: 10 }
Score in producer: [ { encodingIdx: 0, score: 9, ssrc: 3376637265 } ]

and when the disconnection of one of the participants occurs, it enters both events with values:

Score in consumer: { producerScore: 0, producerScores: [ 0 ], score: 10 }
Score in producer: [ { encodingIdx: 0, score: 0, ssrc: 3376637265 } ]

Performing exactly the same thing with v3.13.0 I see that the change logs do not appear over time, only the first time after participant connect:

Score in consumer:  { producerScore: 10, producerScores: [ 10 ], score: 10 }
Score in producer:  [ { encodingIdx: 0, score: 10, ssrc: 240924828 } ]

then not appear again, not even when the participant disconnects. That is, it does not access through events.

[jmillan]

I've tested this with the mediasoup demo and it's working as expected. What do you exactly mean with 'disconnection occurs'? restarting the browser tab?

[AlexLeoRQ]

First of all, a question, is the version of mediasoup used in the demo exactly 3.13.0? Are you sure about this? I ask this because I do not make any type of modification in my code, I simply go from one version to another and I have the indicated problem.

On the other hand, by losing connection I mean that the user loses their network connection, I do this by simply disconnecting the Wi-Fi from the device or removing the network cable.

[jmillan]

is the version of mediasoup used in the demo exactly 3.13.0? A

I've tested it with the latest commit of v3, exactly.

On the other hand, by losing connection I mean that the user loses their network connection, I do this by simply disconnecting the Wi-Fi from the device or removing the network cable.

I'll try it again later by disconnecting the WIFI from the laptop.

[jmillan]

@AlexLeoRQ, can you please try the behaviour of version 3.12.16? which is the one previous to 3.13.0?

[jmillan]

Definitely the Producer and Consumer Score work as before for me testing with mediasoup demo and latest v3 version. When disconnecting the WIFI I get scores 0 for both and when reactivating it I get higher scores until value 10 in my local environment.

[AlexLeoRQ]

I have been testing with different versions of mediasoup, and I have been able to see that the latest version with which we receive the score change is version 3.11.21, with that version and previous versions such as 3.11.20, it works correctly, as I indicated in previous answers. And I have verified that it is from that version onwards that it stops working, that is, with 3.11.22 we no longer obtain the change in the producer score

[ibc]

Indeed this was done in 3.11.22 (as the CHANGELOG.md says) for a reason:

#1061

The thing is: From RTP protocol perspective, it's perfectly fine that a device stops sending RTP and it doesn't mean that its uplink connection is bad. It's just that the encoder decided to stop sending packets. This happens, for instance, in mobile apps using libwebrtc with camera enabled: when switching to another app the encoder stops sending more webcam RTP packets.

So I'm afraid this is expected behavior. Producer/consumer's score` was never supposed to mean "there is continuous RTP flow" and it must not used to figure out network disconnections.