Java Serial Port Service Permission Error
Contents |
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us cannot open /dev/ttyusb0 permission denied Learn more about Stack Overflow the company Business Learn more about hiring developers cannot open /dev/ttys0 permission denied or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow ubuntu dialout group Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Why can't I open/write from a serial port minicom cannot open dev tty8 permission denied on Android? up vote 0 down vote favorite I have written an Android app which runs on a custom kernel on Android 4.4 Kitkat device, which uses the Android Serial Port API (https://code.google.com/p/android-serialport-api/) in order to open the serial port "/dev/ttyACM0" which is the port associated with my serial device. The port has the proper "666" permissions (crw-rw-rw), and the app itself even has the WRITE_EXTERNAL_STORAGE" permission.
Linux Serial Port Permission Denied
However, even though the permissions appear correct, when my app tries to open said serial port using the library, it fails. In my java code, if I try to do a "device.canWrite()" it returns false, whereas a "device.canRead()" returns true. I feel like this is a symptom of a greater permissions problem. If I use the sample apk bundled with the serial port api/library, I get the same issue, where the app fails at the device.canWrite() and throws a SecurityException. The exact same code DOES successfully run and open when ran on a custom kernel ICS device, for which the app was originally developed for. However, the kernels for both were written by the same developer, and at least on a surface glance, the permissions on the port seem to be the same. Is it likely this is an issue that I can resolve on the application code side? I have tried some other serial port libraries (USBSerial3.0, usb-serial-for-android-master) and I seem to encounter the same issue. Regardless of where the issue may lie, would anyone have any ideas of what the problem may be? Making changes to the kernel, app, and api are all on the table. Thank yo
communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or
Could Not Open Port /dev/ttyusb0: [errno 13] Permission Denied: '/dev/ttyusb0'
posting ads with us Ask Ubuntu Questions Tags Users Badges Unanswered Ask Question _ Ask Ubuntu is unable to open serial port putty ubuntu a question and answer site for Ubuntu users and developers. Join them; it only takes a minute: Sign up Here's how it works: Anybody can linux serial port permissions ask a question Anybody can answer The best answers are voted up and rise to the top Changing permissions on serial port up vote 21 down vote favorite 6 I'm using the Arduino IDE in Ubuntu, and am having issues with http://stackoverflow.com/questions/30742524/why-cant-i-open-write-from-a-serial-port-on-android the serial port. It has worked in the past, but for reasons that may be unnecesary, I felt the need to change the ownership of some of the files from root ownership to my users ownership. This made the IDE work correctly, but I lost the ability to use the correct serial port. In the dev folder, the port I need is listed as permission 166. Someone (who is no longer in the area to help me) swapped the permissions to 666, which http://askubuntu.com/questions/58119/changing-permissions-on-serial-port made it all work gloriously. However, it reverted back as soon as I restarted my computer, and if I now try to use the command: sudo chmod 666 ttyACM0 nothing happens. No error messages, but no permission change either. How can I change it, and how can I get it to change permanently. I apologize if this question is overly simplistic or unclear, I'm an ubuntu noob, and I wouldn't begrudge feedback! permissions chmod serial-port arduino share|improve this question edited Aug 22 '12 at 22:57 Doomy 2542314 asked Aug 21 '11 at 17:23 Terrik 213128 sudo chmod 666 /dev/ttyACM0 This was the only suggestion on this page that worked on my 14.04 beta2 live environment. Thanks! –user264842 Apr 3 '14 at 8:01 add a comment| 5 Answers 5 active oldest votes up vote 33 down vote accepted The issue with the permissions for /dev/ttyACM0 can be permanantly solved by adding yourself to the dialout group. You will have to logout and then log back in before the group change is recognized. You can do this with sudo usermod -a -G dialout terrik if terrik is your username. share|improve this answer edited Jan 21 '14 at 20:19 orian 1054 answered Aug 21 '11 at 17:46 Rinzwind 140k17275380 I learnt about this when Arduino IDE asked to give to root to add itself to the "Dailout group". Now I know what it is. –Ufoguy Dec 21 '13 at 18:02 I just purchased a P
(read only) > Software > Troubleshooting > Error opening serial port http://forum.arduino.cc/index.php?topic=49623.0 '/dev/ttyUSBx' on Ubuntu Print Go Down Pages: [1] Topic: https://confluence.atlassian.com/confkb/permission-denied-error-when-binding-a-port-290750651.html Error opening serial port '/dev/ttyUSBx' on Ubuntu(Read 51992 times) previous topic - next topic Helge Milde Newbie Posts: 3 Karma: 0[add] Arduino rocks Error opening serial port '/dev/ttyUSBx' on Ubuntu Dec 03, 2008, 03:42 pm Hi!I'm suddenly permission denied having problems uploading/communicating with my Arduino board via the Arduino Java IDE.. The strange thing is it happened after working for 2 days straight..I was editing a program, continously uploading and testing it, when I clicked the "Serial Monitor" button so I could debug (which had worked linux serial port fine just minutes ago).First I get a lot of weird char's, like you'd get trying to Serial.print a non-alphanumeric byte (although it was an int) - then, after fiddeling with the Serial rate from the IDE (while the Arduino program was still running), I got an error.Ctrl+c, ./arduino and "Upload to I/O Board"... Still get an error.I've tried rebooting Ubuntu, reinstalling the software, removing all components and reprogrammed the Blink-example with my Windows machine (which worked - so I doubt the board is damaged).Below is the full error message. I'm 100% sure the usb-device is correct.processing.app.SerialException: Error opening serial port '/dev/ttyUSB0'. at processing.app.Serial.