Cannot open port after upgrading from 2.10.2 to 2.11.0

[NorbertSandor]

OS: Ubuntu 22.04.4 LTS
Arch: x86_64
Java: 11.0.23-tem

I try to connect to Arduino Mega boards using openPort().

With 2.11.0 I get the error: lastErrorCode=25, lastErrorLocation=768
I also retry opening the port 3-times but all of these attempts result in the above error.

It works with 2.10.2 (although only if I call flushIOBuffers() before openPort() - I don't know why it is necessary :( )

The reason for upgrading (besides keeping the dependencies up-to-date) is that recently we experienced instability with the USB-serial devices. E.g. after successfully running our software, then restarting it, the serial ports fail to connect. In this case only unplugging and replugging the USB cables, OR sometimes only restarting the whole computer helps :(

[NorbertSandor]

It also fails with 2.10.4: lastErrorCode=25, lastErrorLocation=758

Is it the native source code line I should at?

jSerialComm/src/main/c/Posix/SerialPort_Posix.c

Line 758 in 6b792b5

if (setConfigOptions(port->handle, baudRate, &options))

Serial port options:

serialPort = {com.fazecast.jSerialComm.SerialPort@14630} "Serial Device (acm)"
 androidPort = null
 portHandle = 0
 baudRate = 76800
 dataBits = 8
 stopBits = 1
 parity = 0
 eventFlags = 0
 timeoutMode = 0
 readTimeout = 0
 writeTimeout = 0
 flowControl = 0
 sendDeviceQueueSize = 4096
 receiveDeviceQueueSize = 4096
 vendorID = 9025
 productID = 66
 safetySleepTimeMS = 200
 rs485DelayBefore = 0
 rs485DelayAfter = 0
 xonStartChar = 17
 xoffStopChar = 19
 userDataListener = null
 serialEventListener = null
 comPort = "/dev/ttyACM1"
 friendlyName = "Serial Device (acm)"
 portDescription = "Serial Device (acm)"
 portLocation = "1-6.2"
 serialNumber = "7593231383835111D0B0"
 eventListenerRunning = false
 disableConfig = false
 disableExclusiveLock = false
 rs485Mode = false
 rs485ActiveHigh = true
 rs485RxDuringTx = false
 rs485EnableTermination = false
 isRtsEnabled = true
 isDtrEnabled = true
 autoFlushIOBuffers = false
 requestElevatedPermissions = false

[NorbertSandor]

2.10.3 also fails... so the last release version which works is 2.10.2.

[phillipscheng]

I am experiencing this issue as well, but I have isolated it to only being a problem on some machines. My raspberry pi machines experience the issue, but the Windows devices do not.