I would like to query a modem using AT commands using hyperterminal while it is connected, but whenever I try to establish a hyperterm connection, it says that it is in use. I saw a similar post How can I communicate with a 3G modem via pySerial while it is connected? that has the same problem, but my system in running on windows xp, therefore i am unable to switch to a different tty.
Hence I would like to ask if there are any solutions or alternatives to query the modem. Thank you!
3G modems typically (always?) provides two serial interfaces that can be used for AT command communication. Those serial interfaces ends up as /dev/ttyACM0 + /dev/ttyACM1 or /dev/ttyUSB0 + /dev/ttyUSB1 on Linux, /dev/cuaU0 + /dev/cuaU1 on FreeBSD, and on windows machines they should end up as COM<N> + COM<M> for some N and M number (not necessarily next to each other).
So open the device manager and try to find the other serial interface which is not used by hyper terminal and use that one.
Related
I develop on my tablet using android studio.
The tablet is connected to the computer by wifi using
adb connect <ip_andress>:5555
My application contains listeners for USB devices attached/detached.
But unfourtunately, when I connect/disconnect usb device to/from the tablet, the adb connection is getting killed, and I can no longer see the device under "adb devices".
It is not a adb-connection-by-wifi what gets killed. It is just that USB enumerations affect the sys.usb.* system properties which on many devices is causing restart of adbd regardless whether it's being used over USB or tcpip.
Do grep "stop adbd" /init*rc to see what I mean.
You could either comment out those stop adbd lines or just disconnect the USB cable before running your adb connect command.
I was never able to connect my cellphone with my computar through wi-fi.
I had already given up. I followed all the instructions and tips, and nothing worked.
Finally, I did what no one said to do.
I've connected the phone to the WiFi network provided by the cable modem itself and not to some (not all) additional networks that are included in the router.
At home I use one of these networks, because I use a Deco Tp-Link router, which propagates the signal to my entire house, but this network is NOT compatible with ADB. It does not identify it as belonging to the same network.
After this, I use the normal procedure described here.
a) Connect cellphone with a USB cable
b) Find the IP_Phone depends on system in the cell phone. Here I use Settings, About Phone, Status and IP address.
c) Run the following adb commands in Command Prompt (Windows) or Terminal (Linux), where IP_Phone is the IP above mentioned. Normally adb.exe is an executable stored in computer path. adb is already included in Android Studio package.
adb tcpip 5555
adb connect IP_Phone
d) Now disconnect USB cable and it's ready. The cellphone model continues to appear in the status line in the top of Android Studio.
-/-
The best wifi is that defined in Cable Modem. It, unlike an any account defined in my router, answers to a ping command.
ping IP_Phone
Disconnect the usb cable just before running adb connect <*ip_address_of_your_phone*>
I have a text file containing NMEA (GPS) data that I' like to replay to a COM port so the application I'm building can read it.
I considered writing a quick C# console app to loop over the file but I don't have any COM ports. This appraoch would require a virtual COM port and I'm not sure what challenges that would entail.
I also looked at GPSGate. Nice product but it doesn't seem to replay NMEA files over one of its virtual com ports.
How can I stream an existing text file to simulate GPS over a serial connection? I prefer a serial port, rather than mocking, to avoid reworking the application I'm developing and to facilitate use with other applications that use GPS over serial ports for which we don't have source code.
Update 1 - I downloaded a trial version of Virtual Serial Port Driver by Eltima and within a few minutes had some C# code writing to a serial port and appearing in Termite. Yes, it works but $100 seems excessive for what I'm trying to accomplish. Open source or free commercial would be preferred.
gpsfake is part of the gpsd project
gpsfake is a test harness for gpsd and its clients. It opens a pty (pseudo-TTY), launches a gpsd instance that thinks the slave side of the pty is its GPS device, and repeatedly feeds the contents of one or more test logfiles through the master side to the GPS. If there are multiple logfiles, sentences from them are interleaved in the order the files are specified.
You can port the output to a virtual serial via /usr/bin/gpspipe -r | socat - PTY,link=/tmp/gpsd.pty,raw using gpspipe, also from the gpsd project, to be picked up however you choose.
It is POSIX compliant.
You need a virtual serial port such as:
http://sourceforge.net/projects/com0com/
and a hyper terminal replacement.. in XP and earlier it was very easy with the shipped copy of hyperterminal as mentioned bellow..
You set up a virtual null modem connection
Null modem has a COM4 to COM5 Connection established as Null modem std gps is 4800Baud
Hyperterminal to COM5
Application to COM4
Copy paste your NMEA Values into Hyperterminal this isn't 1Hz like GPS though.. to enable 1Hz(or 1 line per second) you will need to find a different application than hyperterminal to send the messages at 1 second increments.
Well..I have found some third party application regarding sending data from com port to IP. but I have not found any basic tutorial regarding them. so can anyone help me with this? I have a GPS device which I will connect to my laptop through usb to serial adapter.Now I need to send that data from a laptop to another laptop on same network. Can I use putty to view that data in another laptop(receiver)? Is virtual serial port driver meant for this kind of application?
If you do not want to write your own tool for it, you can simply use ncat and set up a daemon that reads piped data from one process and broadcasts it to all connected clients.
If you want something that reads the data from the serial port and then transmits it to clients, you'll need to write a server application that accepts connections and sends data around, but there's entire books on this. It should be easy to do for your purposes as written here, but it depends on the amount of control you need.
Alternatively you can use a virtual serial port application as you had mentioned, which might be the easiest route. The two devices will need to be on the same network unless the application supports TCP based virtualization instead of the common Ethernet based implementation.
This Python script works very well as a free "device server". Just enter the serial port configuration and the IP address and port information.
https://github.com/jaredly/pydbgp/blob/master/symbian/serial_tcp_redirect.py
This can work on both Windows and Linux.
You need pyserial.
You can always try using stand alone hardware such as the SENA LS100 device server.
Is there any way to monitor USB devices, connected to the server in Opsview Core?
Or there is any software that I can install to make SNMP possible for USB devices?
Some of the USB security dongles often disconnects by themselves. The point is to have notifications when they lost.
Thanks!
If your USB dongles are connected to the Opsview Server, and if this server is running Linux (i don't know much about Opsview except that it can use nagios plugins), it would probably need only a few lines of code to write a plugin that parses /proc/bus/usb/devices or the output of lsusb and checks for the vendor id / product id / product name of the USB dongles.
I've got a Windows 8 Professional device which has got a Mobile Broadband adapter embedded and I need to be able to send AT commands to the modem, usually I'd connect to the COM port and send the commands. However the device doesn't appear to have any COM ports, instead it presents its self as a network adapter.
I'm wanting to send AT commands to change the APN of the modem and to reset the device, I've looked into the 'netsh mbn add profile' but this command always returns an error advising that the XML profile is incorrect.
Also from looking at the functions of the netsh mbn it doesn't seem to provide as much control as sending AT commands.
The modem that I'm trying to interface to is the Ericsson C5621 GW on a Lenovo ThinkPad Tablet 2.
Is there another way to send AT commands?
Thanks
I do not know this product in particular, but since I worked in Ericsson, later in ST-Ericsson with mobile phone development for over a decade it is doomed to have some of my code in it so I'll answer on a general basis.
Short version is, no unless the device exposes a serial interface over one of the external interfaces (possible interface types are RS-232, IrDA, Bluetooth, USB or CAIF), there is no way of sending AT commands to it1.
Being an embedded device in a laptop and
your since you say it seems to be without serial interfaces I assume it uses CAIF (commonly used in embedded settings. It could also have be using USB with the serial interfaces disabled, but since this press release mentions that it will be available in a version with PCI interface, that is very unlikely). And thus unless the device is set up with any active VEI channels, there is no ways in for AT commands.
There might be other ways of changing the APN though.
1 We had a debug mechanism to inject AT commands onto arbitrary serial interfaces, but this itself was running on a serial interface, started by an AT command. And besides it will not be present in released products.