We wanted to add some Ram to a Lenovo Thinkbook 16P Gen 2 laptop. The hardware manual described removing a mylar that was sitting over the RAM area - it says the mylar is not reusable and it didn't seem to serve any purpose so we didn't try to stick it back on after fitting the new RAM. Does...
Can anyone suggest which of the two laptops is best for software development.
https://www.pbtech.co.nz/product/NBKASU535232/ASUS-Zenbook-Pro-15-OLED-Business-Laptop-156-FHD-T
https://www.pbtech.co.nz/product/NBKLEN16001/Lenovo-ThinkBook-16p-G2-RTX-3060-Power-Business-16
Price, CPU and screen...
I'm doing a Flutter app using Firebase and I would like to be able to send data directly from one mobile/PC device to another. If a device sends its IP address to Firebase can another device ask for that IP address and use it to send data directly to the other remote device using TCP. The two...
Has anyone bought a mini pc from ali express?
Any idea which is best out of these two - they seem to be the same product? Would fanless be more reliable than with a fan?
hystou i7 8750 16GB ram 256 SSD DDR4
KINGDEL i7 8750 256 GB SSD 16G DDR4 ram
A techTablet video on youtube suggested you...
Awesome, thanks a lot.
I found some code here
stackoverflow
where both ends of the UDP connection are doing bind and connect.
Supposedly making a permanent connection is more efficient.
Does that look like a reasonable way to do it?
I'm writing some embedded Linux software where we have two microprocessors on the same PCB and they communicate with each other using UDP through a switch that is embedded on the PCB. Each application has a hard coded IP address. I want to use non blocking send and receive and I found some...
I'm writing some embedded Linux software where we have two microprocessors on the same PCB and they communicate with each other using UDP through a switch that is embedded on the PCB. Each application has a hard coded IP address. I want to use non blocking send and receive and I found some...
I posted a question on a wireshark forum and some incredibly observant person noticed that for the SYN -> ACK messages that open a TCP connection, the source mac address in the SYN is different to the destination mac address in the ACK sent by the PC i.e. the ACK is going to a different access...
Thanks, that's helpful. Here's some more detail
A tablet that is struggling to get feedback is sending a TCP connection reset (RST) right at the start of the TCP transaction e.g. - (source port is 57727)
2136.258745 192.168.1.58 192.168.1.10 57727 -> 9000 [SYN] Seq = 0
2136.258893 192.168.10.1...
Your comments are nonsense. The traffic sent between tablets and the scoring PC is very very small - maybe something like a total of 2000 TCP connections over a three hour period across all tablets - ten a minute. Windows can handle 220000 simultaneous TCP connections.
A few weeks ago I asked about how to capture wifi messages because of a problem we're having at my Bridge club we're our tablets sometimes have a problem getting feedback from the scoring PC.
https://community.ubnt.com/t5/UniFi-Wireless/how-to-log-wifi-traffic/m-p/2691423#M371460
We have two...
It seems that the problem is caused by the software in the tablet that is timing out too quickly (2 seconds). For some reason the software on the scoring / server machine is slow to respond so the tablet reports "no response - click retry". If you hit retry, the tablet opens another TCP...
There's a club in Auckland with the exact same problem - same access points and same tablets. However they're not surrounded by townhouses like we are but there's lots of sources for Wifi interference. It's possible that web browsing works because it uses TCP. I'm guessing the BridgeTab...
This problem.
http://www.portvapes.co.uk/?id=Latest-exam-1Z0-876-Dumps&exid=threads/wifi-problem-at-bridge-club.2557368/
Two access points plus a third access point for "member wifi".
My Bridge club has been having intermittent wifi problems. Does anyone know if it's possible / viable to run wireshark on a Windows laptop and capture all the messages between tablets and the access points to see what is happening.
Also, if I connect to the access point from my Windows 10...
We don't want users to have to choose the best signal. I've confirmed that the tablets are automatically switching channel when needed however most of them get a strong signal (less than -50dbm) from all three access points and the access points support 200 clients. We have typically 25 to 45...
Unbeknown to me, the club put in a third access point yesterday. The clubrooms are a "U shape" so they can't all cover the whole area - but they're all on the same SSID. I do not know how the tablets will pick a channel as all three signals are strong. For some reason, last night there were...
Thanks. I doubt if any members have the wifi password but I will check. Lots of people have phones though so maybe we should ask them all to power off or switch to airplane mode. Someone from another club told me that disconnecting their server from the internet while a session was in...
There's an interesting article here about them
review
It looks like the controller software can show percentage of dropped packets sent and dropped packets received.
Here's a link to some screenshots of the wifi db levels
wifi db levels
Channels 6 and 11 are our two access points. There's...
Also, there's probably over a dozen stray 2.4 GHz wifi signals coming in to the building - 2.4 GHz seems to go a long way. How would we pick which channels to use for our access points? I believe they were changes to use non-overlapping channels a while ago and that helped.
Thanks. The tablets definitely cannot see a 5GHz channel - I took one home and checked. The AP is 1300 Mbps for 5 GHz. The most devices we've had connected so far is 45 and the most tables our clubrooms can hold would need 55 tablets.
We have two of these access points in the ceiling, one...
The access point is Ubiquiti UniFi AP-AC-Pro
UniFi_AP-Pro_UG.pdf
looks like it can handle 250 clients. It can display the percentage of packets dropped.
Is there any software that can be installed on a tablet to show the number of dropped packets?
My Bridge club has a number of Lenovo tablets TB3-710F. With some of them, the screen occasionally goes black and the device becomes unresponsive. Is there any possibility that the device has decided to auto-update the operating system and that's why the screen goes black. I found a site here...
Thanks, that's useful information. I don't understand the latency data though. If the latency is the "internal switching delay imposed by the switch electronics", why does it vary with the connection speed? Also does "switch electronics" include any software processing delay?
You're correct...
Does anyone have an idea of how much delay / latency there is in getting a 1500 byte message through a "typical" ethernet switch on 100 Mb/s cable or on fibre. We want to send a "synch clock" message from one device to another through ethernet switches and we need it to arrive as quickly as...
Regarding packet ordering I was just wondering what happens when a break on the ring occurs whether any packets that have already been sent out get re-routed to go in the other direction. I don't really want to say what we do, sorry.
It's redundant as far as the installation standards requirement is concerned. The redundancy only applies to a fault in external wiring plus a total failure of one device isn't allowed to affect communication between other devices. The MOXA switch must be providing electrical isolation between...
Not sure what you mean by double tap but the connecting device has only one ethernet port and any "duplicate wiring" would have to traverse physically separated paths. There would also be cable length problems I think.
I don't know what profinet is, except for what I can see on wikipedia.
oops, missed your second question. Traffic is fairly light, except when VOIP is happening but even then it's not too bad. Most traffic doesn't care about latency except for a homegrown version of NTP that we use for synchronization of audio.
Can be up to 64 switches, sometimes connected with fibre because it goes further. There is a requirement for temperature tolerance but I don't think it's anything special.
yes, switch 1 - - - switch 2 - - - switch 3 - - - // - - - switch N - - - back to switch one.
If there's a single break anywhere, all switches are still connected.
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