Low number of Wi-Fi concurrent connected users
Hello,
first, thanks für the good work. I love the idea of moodlebox.
But I've the same problem. The maximum of connection was 10 users.
I'd tried it several months ago with a raspberry pi 3b+ and this week with the new raspberry pi 4. I worked with different power supplies. The red light was always stable.
Two questions
Is there any new idea for fixing the problem?
where can i find the "soft" indicator, if the supply voltage drops.
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ThomasG That is disappointing! I am sure, I had more connected (13?) in an earlier version, on RPi 3B. Others have also reported up to 20+. Can you ask your users to connect one-by-one after, waiting till their predecessor appears on the MoodleBox Dashboard (Site administration > Server > MoodleBox > MoodleBox dashboard)?
There is a soft indicator for low voltage - a red button. It appears only if the supply voltage drops.
@Nicolas Isn't it an idea to display the button always and make it change in colour?
ThomasG where can i find the "soft" indicator, if the supply voltage drops.
The warning is displayed to administrators of the Moodle, on every Moodle page. This was added to MoodleBox version 2.7.0, but you can simply upgrade the MoodleBox plugin to the last version and get the feature.
Hi Nicolas, now I see the problem with my suggestion. The low voltage warning appears on top of every page. A voltage OK message on top of every page would be annoying! I am taking back the suggestion.
so to adjust the amount of people we have to go to MoodleBox Dashboard (Site administration > Server > MoodleBox > MoodleBox dashboard)?
Entitymarck20 Do you mean, you want to limit the number of wireless devices that can be connected to the MoodleBox hotspot? No, there is no such setting.
Ratna I do not mean to limit, but to expand the use of connected PC at the same time, since I think for the other year to implement it in the school that I am, but I only connect 10 pc
Entitymarck20 If you can connect only 10 devices, check the red LED and change your power supply!
Nicolas When it comes to the LED, it is the one that produces the raspberry pi and the source is going to change these days, since I am using the one on my phone, what voltage do you recommend?
Entitymarck20 Yes, it is the red power LED we are talking about. Read, In the later models (A+, B+, Pi 2 & Pi 3) the power LED ... will flash if the voltage drops below 4.63V. Ref. https://www.raspberrypi-spy.co.uk/2013/02/raspberry-pi-status-leds-explained/
Ordinary telephone chargers are certainly too weak to power the RPis, which MoodleBox recommends - the models 3 and 4. Voltage is not the limitation, BTW the voltage has to be stable 5.1 V, it is the amount of current the supply could deliver that matters. In the models 3 and 4, we are advised to take 2 to 3 A supplies.
What is your RPi model, BTW?
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And to add up to Ratna comment: I recommend the official power supply (for RPi 3B+ and earlier, for RPi 4B), as stated in the doc.
I've never had any undervoltage warning with these.
Hi. I have been posting on other chats about the limits I am experiencing with regards users logged in to the pi4.
I have just tested a wifi range extender to see if it helps. Logic told me that a bottle neck is a bottleneck and won't be resolved by adding a range extender.
My logic was wrong - I connected it and had 10 devices running videos at the same time - I ran out of devices so don't know the limit.
Previously I could only run 5 devices and the 6th caused a crash/freeze
All I need now is one that will run from 5v instead of from the wall so I can connect to my solar panel units then 100% off grid lessons 
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Ian Hi Ian, It is not that difficult. The wireless transmitter is a separate electrical system from the CPU and RAM. So more CPU power has no effect on the wireless power, just as much as a stronger CPU isn't capable of making the LED burn brighter, everything else remaining the same!
But one question remains unanswered: Why is the max. number of connected wireless clients go down. There were initial reports of 20+. The OP mentions 17-19. My (only) test about a year ago gave me 14. You are talking of 7. (I am interested only in the built in wireless transmitter. It is clear to me, that additional hardware changes that number.) I thought the built-in wireless chip remained the same since Pi 3 Model B. If I'm not mistaken, it was the same even in their previous wi-fi adapter for USB. Then the number should not change, definitely should not go down. Is the antenna, yes there is a rudimentary antenna etched on to the PCB, getting changed, or there is bug in the Linux driver after all. (There was a discussion somewhere in the Internet to the latter.) From a practical standpoint it is easy to test: get a Pi 3 B and a 4 B, also two versions of MoodleBox and try all the combinations.
BTW, if you depend on solar panels, I would seriously look at Pi 3 B - not even 3 B+. I wonder, for MoodleBox serving a dozen of wireless devices, they make a difference. But in power consumption they do: 3 B+ needs double the power of a 3 B.
The power consumption of various Raspberry Pi models in numbers:
http://www.pidramble.com/wiki/benchmarks/power-consumption