Openhab, Symlink, modbus - not port?!

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1

Hello all. i am not a specialist in openhab, i nowadays is learning. i have a questions at the my learning. Please help me)
i created Symlink СhinaArduino for my arduino and this works now.
but when I run openhab i see error on console
in etc/init.d/openhab i am added string in args: -Dgnu.io.rxtx.SerialPorts=/dev/ChinaArduino4
(https://github.com/openhab/openhab/wiki/symlinks)

 Error connecting connection SerialConnection@8970bc[portName=/dev/ChinaArduino4,port=<null>] for e                                                        ndpoint ModbusSerialSlaveEndpoint@4cc1fd[portName=/dev/ChinaArduino4]: Could not get port identifier, maybe insufficient permissions. null
15:02:08.074 [WARN ] [.b.modbus.internal.ModbusSlave:355  ] - ModbusSlave (slave1): Error getting a new connection for endpoint ModbusSerialSlaveEndpoint@4cc1fd  [portName=/dev/ChinaArduino4]. Error was: Unable to validate object
15:02:08.085 [WARN ] [.b.modbus.internal.ModbusSlave:495  ] - ModbusSlave (slave1) not connected -- aborting read request net.wimpi.modbus.msg.ReadMultipleRegistersRequest@1babac. Endpoint ModbusSerialSlaveEndpoint@4cc1fd[portName=/dev/ChinaArduino4]
15:02:12.110 [ERROR] [pi.modbus.net.SerialConnection:125  ] - Could not get port dentifier, maybe nsufficient permissions. null
15:02:12.113 [ERROR] [dbusSlaveConnectionFactoryImpl:225  ] - connect try 1/3 error: Could not get port identifier, maybe insufficient permissions. null. Connection SerialConnection@1c5572e[portName=/dev/ChinaArduino4,port=<null>]. Endpoint                                                         ModbusSerialSlaveEndpoint@4cc1fd[portName=/dev/ChinaArduino4]
15:02:12.179 [ERROR] [pi.modbus.net.SerialConnection:125  ] - Could not get port identifier, maybe insufficient permissions. null
15:02:12.183 [ERROR] [dbusSlaveConnectionFactoryImpl:225  ] - connect try 2/3 er                                                        ror: Could not get port identifier, maybe insufficient permissions. null. Connec                                                        tion SerialConnection@1c5572e[portName=/dev/ChinaArduino4,port=<null>]. Endpoint ModbusSerialSlaveEndpoint@4cc1fd[portName=/dev/ChinaArduino4]
15:02:12.245 [ERROR] [pi.modbus.net.SerialConnection:125  ] - Could not get portidentifier, maybe insufficient permissions. null
15:02:12.248 [ERROR] [dbusSlaveConnectionFactoryImpl:225  ] - connect try 3/3 error: Could not get port identifier, maybe insufficient permissions. null. Connection SerialConnection@1c5572e[portName=/dev/ChinaArduino4,port=<null>]. Endpoint ModbusSerialSlaveEndpoint@4cc1fd[portName=/dev/ChinaArduino4]
15:02:12.255 [ERROR] [dbusSlaveConnectionFactoryImpl:228  ] - re-connect reached max tries 3, throwing last error: Could not get port identifier, maybe insufficient permissions. null. Connection SerialConnection@1c5572e[portName=/dev/ChinaArduino4,port=<null>]. Endpoint ModbusSerialSlaveEndpoint@4cc1fd[portName=/dev/ChinaArduino4]


root@raspberrypi:/home/pi# ls /dev -l | grep USB
lrwxrwxrwx 1 root root           7 ноя 24 18:19 ChinaArduino3 -> ttyUSB1
lrwxrwxrwx 1 root root           7 ноя 24 18:19 ChinaArduino4 -> ttyUSB0
crw-rw-rw- 1 root dialout 188,   0 ноя 24 18:19 ttyUSB0
crw-rw-rw- 1 root dialout 188,   1 ноя 24 18:19 ttyUSB1

A lot of hidden rocks under the water. How To Fix? Please help)

2

Do you have the correct permissions to read the serial port?

If you are using apt installation of openhab, the openhab user must be part of dialout group: Check note 4 in serial binding wiki page

Best
Sasmi

1 Like
3

Thank you for answering my questions
i used not apt-get install method.
i don’t have openhab user
This is my permission:

root@raspberrypi:/home/pi# ls /dev -la | grep USB
lrwxrwxrwx  1 root root           7 ноя 28 18:17 ChinaArduino3 -> ttyUSB0
lrwxrwxrwx  1 root root           7 ноя 28 18:17 ChinaArduino4 -> ttyUSB1
crwxrwxrwx  1 root dialout 188,   0 ноя 28 18:17 ttyUSB0
crwxrwxrwx  1 root dialout 188,   1 ноя 28 18:17 ttyUSB1
4

Have you tried the device (ttyUSB#) directly, and not the symlink?

Best
Sami

1 Like
5

Yes, of course.
When i use ttyUSB* this is nice works.
I’m in the wrong…

6

Hi @1injener!

Just a couple of questions:

  • Can you show use your udev rule?
  • What have you specified in the MODE parameter?

Best regards,

Aitor

1 Like
7

i use:

SUBSYSTEM=="tty", ATTRS{devpath}=="1.4.1", SYMLINK+="ChinaArduino1",GROUP="dialout", MODE="0777"
SUBSYSTEM=="tty", ATTRS{devpath}=="1.4.2", SYMLINK+="ChinaArduino2",GROUP="dialout", MODE="0777"
SUBSYSTEM=="tty", ATTRS{devpath}=="1.4.3", SYMLINK+="ChinaArduino3",GROUP="dialout", MODE="0777"
SUBSYSTEM=="tty", ATTRS{devpath}=="1.4.4", SYMLINK+="ChinaArduino4",GROUP="dialout", MODE="0777"

and when i use MODE=“0666” (as described in https://github.com/openhab/openhab/wiki/symlinks) i have error…

8

Ummmm… I’m not really sure what’s going on here…

Why are you editing the /etc/init.d/openhab file instead of the /etc/default/openhab one? By the way, you need to add the “-Dgnu.io.rxtx.SerialPorts=/dev/ChinaArduino4” string to the JAVA_ARGS field instead of the OPENHAB_ARGS field, just to be sure that you are editing the correct parameter.

Best regards,

Aitor

1 Like
9

Good afternoon!
Of course, I did it.

Pasted image1083×552 28.7 KB

in default i have java version 1.7. At the same time I had an other error to modbus and i update java to 1.8.

root@raspberrypi:/home/pi# java -version
java version "1.8.0_111"
Java(TM) SE Runtime Environment (build 1.8.0_111-b14)
Java HotSpot(TM) Client VM (build 25.111-b14, mixed mode)

reminder (it can help?): my openhab version: 1.8.3
(in this version there is an error with modbus binding and I replaced the file org.openhab.binding.modbus-1.8.3.jar to org.openhab.binding.modbus-1.9.0.jar - error disappeared. Thanks ssalonen! )
/dev/ttyUSB0 - work good
symlink - have error.