I tried out the #ooni network tester app from #FDroid. I have good connectivity here in #Malaysia, both from a cellular SIM card connection, and the monastery wifi (a fiber internet connection).
But alas, the Ooni tests don't test for #XMPP, in their instant messaging apps testing! Only #Facebook, #Signal, Telegram, and Facebook Messenger are tested for, apparently. I do have trouble with XMPP, on the fiber internet here. Insidiously, brief XMPP text messages can be sent, but any video memo (say, 40MB in size, about 4 min worth of video) will only 1% upload, then get stuck. Attempts to resend will keep getting stuck. It seems that the XMPP traffic gets throttled to nothing after a small amount of data is sent: say, 400kb or so. I *can* send these video memos from my cellular SIM card connection.
I wish Ooni could have warned me about this, as it caused a friend to not receive a video memo for about 10 days, until I caught on to what was happening.