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B4J Question B4J libraries for hardware under Linux
- Thread starter peacemaker
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So, code is the same as for Windows ? Do you mean the port cannot be open due to some permission ?
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Yes, the code is same for async stream.
The difference is the name of the com port.
You need permission to work with the COM port in Linux.
Serial in Linux
Hello All, I am trying to use the JSerial lib in ubuntu with no success. Anyone knows if I can use this Lib in Linux ? I get an exception error when i try to open the com1 (its working and reported in system) /dev/ttyS0 And even a simple application to list all ports serial.listports returns a...
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Thanks, Aeric, indeed.
I have set up WSL2 like here https://learn.microsoft.com/en-us/windows/wsl/connect-usb, and it can detect the serial device, but only under SUDO.
But how the app should be installed\provided for end-user ? With setting up the permissions\group rights ?
I have set up WSL2 like here https://learn.microsoft.com/en-us/windows/wsl/connect-usb, and it can detect the serial device, but only under SUDO.
B4X:
#if B4J
#if LinuxDebugging or LinuxProduction
Dim USBportPrefix As String = "/dev/tty" '/dev/ttyUSB0
#else
Dim USBportPrefix As String = "COM" 'Windows COM-ports
#End If
#Else if B4A
Dim USBportPrefix As String = "/dev/bus/usb/" '/dev/bus/usb/001/003
#End IfBut how the app should be installed\provided for end-user ? With setting up the permissions\group rights ?
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If the special permission is required for access to the COM-ports under Linux, and moreover after "sudo usermod..." the re-login is required - it means each app user must setup manually it for his user account
It is not for "windows clickers"...
It is not for "windows clickers"...
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Ha !
jSerial works OK under Windows, as well known and using, but ... it works OK also under Ubuntu Linux ! Tested as part of Win10 WSL2 - virtual Linux.
But if to try on real laptop under Linux Mint21 - it does not work, port is detected, but connection is done very rare and some system error is:
Anyone seen, why different ?
jSerial works OK under Windows, as well known and using, but ... it works OK also under Ubuntu Linux ! Tested as part of Win10 WSL2 - virtual Linux.
But if to try on real laptop under Linux Mint21 - it does not work, port is detected, but connection is done very rare and some system error is:
Anyone seen, why different ?
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It works on my old laptop, may be an audio configuration or driver issue on a device by device basis. WSL does not currently support Audio.
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Yes, thanks, i found other PC - the generator works there under Linux, in release mode, sure only.
Now problem is with COM-ports....
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I have been using a few B4J apps that access the serial port on both Windows and a variety of Linux Platforms (Ubuntu, Debian, etc.). Never had any issues with permissions. The default permission for the serial ports work fine. The application always runs under a sudo user. The serial ports tested are native serial ports as well as Virtual USB serial ports (/dev/ttyUSBx) using a serial/USB adapter. No issues with either.
Yes, depending on the driver, the program will crash if the USB/Serial adapter is unplugged. In some cases (driver/hardware) it will throw an exception and then automatically recover when the adapter is plugged back in. I have been unable to catch these exceptions using Try-Catch. So what I do is run the application as a systemd service and set it up so if the program crashes the service is restarted automatically. This will happen continuously until the devices is plugged in and detected again.
Yes, depending on the driver, the program will crash if the USB/Serial adapter is unplugged. In some cases (driver/hardware) it will throw an exception and then automatically recover when the adapter is plugged back in. I have been unable to catch these exceptions using Try-Catch. So what I do is run the application as a systemd service and set it up so if the program crashes the service is restarted automatically. This will happen continuously until the devices is plugged in and detected again.
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Ha, this allows all.
Yes ! Stupid. Under Windows all works automatically and all errors catched OK.
GUI app as a service ?! How to do it ?
My app under Windows can work with many USB-COM-ports at the same time in "plug-n-play mode", any can be detected when plugged or removed in the app when unplugged OK.
But now you explained - under Linux desktop it is impossible.... unbelievable.
Even the alone USB-device cannot be unlugged without crash ?! Maybe we have to track the USB devices events some how to close the COM-port on time?
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No, I have never tried running a GUI app as a service. My apps are all console apps. But I don't see why a GUI app would not run? I may give it a try if I get a chance.
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