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.
Related
I write code for embedded control systems and frequently use proprietary black-box modules to communicate with external devices. In my world, RS-232 connectivity is still commonplace. More and more devices, however, are joining the modern world and implementing various TCP and UDP options.
One such device runs an SSH server and interacts with an SSH client opened by the proprietary module. I have to develop code without the device. If this were RS-232, I could simply open a terminal connected to RS-232 and interact with the module, seeing what is sent and sending replies to observe the module's behaviour.
I'm looking for SSH and Telnet "servers" that would allow me to do the same for sessions on those protocols. So far, I've found SSH honeypots that allow me to see payloads from the client, but nothing that lets me send strings in return.
I suspect there's a solution out there, but I simply haven't the vocabulary to describe it. All clues welcome.
How is it possible to determine the commands to operate a usb device, if that device comes from another operating system and traffic monitoring software cannot be installed on that OS. The only method i can think of is sending random commands to the device, until the device responds, but this seems implausible for more complex commands, and potentially dangerous. For example, consider the DualShock 4 controller. Sony has not made an official driver for this device, so what method can i use to create a linux driver for it?
Get a hardware protocol analyzer. Then you won't need to install any software on the host or device under test. Here is one that I have used:
http://www.totalphase.com/products/beagle-usb12/
I have been researching for a couple of days, and i have not found anything I understand about sending direct commands to the NXT via USB. All of the tutorials I have found are based on Bluetooth communication, and the information I have found about USB is always like "Better change to bluetooth", or "Think about it as a COM port"
I had previously sent those commands via Bluetooth, but the connection fails too often to be useful, and is slower than USB.
USB connection is not detected as a COM port, but I know it is posible to control motors and get sensor input with a USB connection, because the LEGO software does so. It has that remote control feature that allows user to activate motors from the PC, and can read sensor input as well.
So, my question is, How can I send and recieve those direct commands via USB? and, Is there any way to do so in Visual Basic 2008?
You can use the MonoBrick Communication Library to do this. See http://www.monobrick.dk/software/monobrick/.
Alternately, you could use the Fantom driver from the official LEGO Software developer kit. http://www.lego.com/en-us/mindstorms/downloads/software/nxt-sdk/
I'm working on a Communications Device Class (CDC) driver for an embedded device, a Full Speed implementation of USB 2.0. The COM port settings are 115200, 8-bit, no parity, 1 stop bit, no flow control. Our PC application (32-bit, Windows 7, .NET 2.0) communicates with the target device through a virtual COM port, which on the target device can connect to either a FTDI (USB-to-SCI bridge) chip or the integrated USB peripheral in the microcontroller, depending on which port is selected by the application.
Both virtual COM ports work without any problems using Realterm. However, while our desktop application works using the virtual COM port connected via the FTDI chip, it hangs when attempting to use the virtual COM connected via the microcontroller's integrated USB peripheral.
When connected via the virtual COM port using the integrated USB, the application consistently hangs on the second call to SerialPort.Write(...). Using Serial Monitor from HHD Software I can see that the data is transmitted on the first call to SerialPort.Write(...). However, that data is never received by the target device.
It's odd because the only time I have seen similar problems on previous projects was when the flow control settings on each side of the bus were mismatched.
Additional info...
Here is the data captured from various port monitoring tools while running our PC application connected to the target device via its integrated USB peripheral. Any insight would be appreciated.
Sysinternals Portmon
Advanced USB Port Monitor
Device Monitoring Studio - Request View
Device Monitoring Studio - Packet View
For those that are interested, I am using CodeWarrior 10.2 with the MCF51JM128 from Freescale.
Any ideas or suggestions would be appreciated. Thanks.
It is clear from the logs that you are making the classic mistake of not taking care of the hardware handshaking signals. That only ever works by accident, a terminal emulator like Realterm will never make that mistake.
You must set the DtrEnable property to true. That turns on the Data Terminal Ready signal. It is important because RS-232 is an unterminated bus so is subject to electrical noise when the cable is disconnected or the power turned off. DTR convinces the device that it is in fact connected to a powered device. This is emulated of course in your case but the driver or firmware will still typically implement the RS-232 behavior.
And the RtsEnable property is important, used to handshake with the device and prevent the receive buffer from overflowing when the app isn't emptying the buffer in a timely matter. You really should set the Handshake property to Handshake.RequestToSend, the most common way a device implements it. Which then also takes care of turning RTS on. If you have to use Handshake.None for some reason then you have to turn it on yourself by setting RtsEnable to true.
This ought to take of the problem. If you still have trouble then use PortMon to spy on the way Realterm initializes the driver. Compare the commands you see against the commands that the SerialPort class sends. Make sure they are the same. In value, not in sequence.
I have a Nokia Symbian Series 60 3rd edition phone. I can use it as a GPRS / 3G modem either using Bluetooth, USB or IR.
Is there a way to programmatically detect when the phone is being used as a modem?
Please note I don't want to detect when a GPRS / 3G connection comes up (such as when you use the phone browser), but when a GPRS / 3G connection comes up that is the result of the phone being used as tethered modem via BT / IR / USB.
So the user has set up a dial up networking connection on their laptop, for instance, which uses the modem in the phone. They then launch that connection because they want to make a 3G wireless internet connection from their laptop via the phone. That's what I'd like to be able to detect from the phone.
I don't believe there's any public interface that you could use for this. You could probably use internal APIs to check what is creating the data connection, or more crudely check which processes are running when a data connection is created - probably quite easy to fool this method, depends why you want to know?
I can see network operators wanting to do this to block and/or charge extra for tethering usage. Easiest way to do that would be network side though, checking the browser UA header (also possible to fool, but not without harming your browsing experience a bit on the laptop).