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I've been having problems getting a 5G only connection using waveshares https://www.waveshare.com/wiki/SIM8200EA-M2_5G_HAT for the raspberry pi.
Anyone know the the appropriate AT-commands ?
I am also using this 5G module but with Jetson Nano and Windows. To force 5G, run this command.
AT+CNMP=71 //if your module green led turns off using this command, run the following command
AT+CNMP= 39 //AT command for 4G (LTE)
I never get 5G on my module.
You can get information about which access technology that is used with the AT+CREG network registration command (AcT parameter) and you can control which to used with the AT+COPS command.
In your case, the manufacturer documentation is linked as "SIm8200 Series AT Command Manual" on the wiki page you linked, and that should be your primary source of information. The commands are standardized by 3GPP in 27.007 so you could have a look there as well.
PS Make sure you properly understand how to send and read and parse AT command lines and response lines.
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We have been using Linphone for our calling services and its working fine on wifi and almost every cellular network except the one with iPV6 infrastructure.
The problem we discovered with iPV6 environment is that our signalling ip changes very frequently and as a result our call drops after 30 seconds timeout.
Any guide regarding this matter will be helpful.
Thats happens often on 5G network.
You can do nothing here, it is not related to asterisk, it is related to how 5G providers handle NAT. The do not care.
Only thing you can do is use android/apple push mechanism to force your application to re-register with new IP.
You can do nothing if customer change GSM cells while in call. Except maybe issue re-invite, but that is really hard and I know no softphone which do that correctly.
Another option is to use tunnel with ping inside it/resetup(or setup ignore source IP for tunnel) and put your sip traffic inside tunnel. But that WILL eat battery a lot and customer will complain or uninstall your app.
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I use CentOS 7 with Apache server. The problem who command does not show clients connected with WinSCP. Can't understand why.
The problem who command does not show clients connected with WinSCP. Can't understand why.
Apparently, then, you are operating from a false premise. The who command does not promise to name everyone interacting with the system in any way whatever. Roughly speaking, who tells you about users who have an associated terminal, whether physical or virtual. Connecting via an scp client does not establish a login session or allocate a terminal for who to report on.
Contrast users who connect via ssh clients: these do get a terminal assigned to them, and they do show up in the output of a suitably-timed who command.
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The scene is under VMWare, and the os in vm is Ubuntu 12.
What I have to say is the network was actually suddenly cut off when I was coding. My two colleagues were all have the problem. It seems very odd. It just is a vm dev environment. Why three person will occur it in a not long time periods. I couldn't ping the IP in VM from my host, and vice versa.
At the first time, I think it is the problem of network adapter of VMware. But it didn't work after I removed the network adapter and re-added it.
But this time, I think ping it. But the network is very slow. I just ping a IP, not a domain.
So, when I used wireshark to see what is the problem.
As the picture show below. I think it is a virus. The random string before <00>.
Anyone can give me the solution or some hints? Thanks!!
Perhaps it's a virus called Chrome, from a company called "Google"; Chrome appears to make various weird name queries.
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EDIT: i would really appreciate a source or an example that talks about this being done.
Some companies have a distributed program written in C++, it runs on different machines, it uses TCP/IP for inter communication between different machines (windows and linux). Is it possible to write a program from the ground up using other languages (python, java) that will be able to join their network?
Yes. Of course, TCP/IP is language agnostic. The key issue is to get the protocol correct.
If you have the specification for what is being communicated (or can reverse-engineer it), then yes. Without knowing what to send, and what to expect back it'll be a losing battle.
Of course! That's why it is a protocol: you don't have to know who is on the other side, as long as it follows the protocol specification
Based on edit:
This info is anywhere, based on the language you want to use. Here is a basic python example for tcp communication
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I want to Know my modem support caller-id and show number or not
I use this AT-command:
AT+FCLASS=?
I know if that response contains 8 support voice but if modem dosnt support voice it means cant support caller-id too?
I use Conexant USB CX93010 ACF Modem
I assume you by caller-id means the supplementary service called CLIP - Calling Line Identification Presentation (for GSM/UMTS networks). You can check if your modem supports this by running AT+CLIP=?. To enable +CLIP: ... unsolicited responses after RING run AT+CLIP=1. Read 27.007 for more details.