Attempt to bind ttyMyGatewaySerial to openhab failing miserably

[jerseyguy1996]

Raspberry Pi3
Running openhab v1.8.3
nRF24L01+ connected directly to SPI of the Raspberry Pi using this instruction:

https://forum.mysensors.org/topic/2437/step-by-step-procedure-to-connect-the-nrf24l01-to-the-gpio-pins-and-use-the-raspberry-as-a-serial-gateway

This gives me a serial gateway "ttyMySensorsGateway" and as the instructions specify I have a symbolic link between that and "ttyUSB20" (whatever that means....sorry new at some of this stuff):

ttyMySensorsGateway
ttyprintk
ttyS0
ttyUSB20

Next I followed this instruction:

https://forum.mysensors.org/topic/3108/openhab-binding

This is the result of all of this in the openhab debug log. What steps am I missing here?

2016-07-16 22:59:50.599 [DEBUG] [i.internal.GenericItemProvider] - Start processing binding configuration of Item 'Temperature (Type=NumberItem, State=Uninitialized)' with 'MySensorsGenericBindingProvider' reader.
2016-07-16 22:59:50.608 [DEBUG] [ySensorsGenericBindingProvider] - New Item "Temperature (Type=NumberItem, State=Uninitialized)" based on configuration "3;1;V_TEMP"
2016-07-16 22:59:50.609 [DEBUG] [i.internal.GenericItemProvider] - Start processing binding configuration of Item 'Temperature (Type=NumberItem, State=Uninitialized)' with 'MySensorsGenericBindingProvider' reader.
2016-07-16 22:59:50.610 [DEBUG] [ySensorsGenericBindingProvider] - New Item "Temperature (Type=NumberItem, State=Uninitialized)" based on configuration "3;1;V_TEMP"
2016-07-16 22:59:50.656 [DEBUG] [.b.m.internal.MySensorsBinding] - activate
2016-07-16 22:59:50.723 [ERROR] [.o.b.m.internal.gateway.Serial] - Unable to find Serial port '/dev/ttyUSB20'
2016-07-16 22:59:50.724 [INFO ] [.service.AbstractActiveService] - MySensors Refresh Service has been started
2016-07-16 22:59:50.728 [DEBUG] [inding.ntp.internal.NtpBinding] - Got time from ptbtime1.ptb.de: Saturday, 16 July 2016 22:59:50 o'clock UTC
2016-07-16 22:59:50.747 [ERROR] [.service.AbstractActiveService] - Error while executing background thread MySensors Refresh Service
java.lang.NullPointerException: null
	at org.openhab.binding.mysensors.internal.gateway.Serial.write(Serial.java:82) ~[na:na]
	at org.openhab.binding.mysensors.internal.MySensorsBinding.execute(MySensorsBinding.java:178) ~[na:na]
	at org.openhab.core.binding.AbstractActiveBinding$BindingActiveService.execute(AbstractActiveBinding.java:156) ~[na:na]
	at org.openhab.core.service.AbstractActiveService$RefreshThread.run(AbstractActiveService.java:173) ~[na:na]```

[jerseyguy1996]

Woo Hoo!!!!

2016-07-17 15:39:53.970 [DEBUG] [.o.b.m.internal.gateway.Serial] - Serial port '/dev/ttyUSB20' has been found.

Not sure what fixed it. I added pi and openhab to user group 'tty' and then rebooted. Okay baby steps here....moving on.

pi@raspberrypi:~ $ sudo adduser pi tty
Adding user `pi' to group `tty' ...
Adding user pi to group tty
Done.
pi@raspberrypi:~ $ sudo adduser openhab tty
Adding user `openhab' to group `tty' ...
Adding user openhab to group tty
Done.

[jerseyguy1996]

Oh my gosh....I'm officially geeking out!

2016-07-17 15:42:54.396 [DEBUG] [.b.m.internal.MySensorsBinding] - Gateway Version: 1.4```

[jerseyguy1996]

OH MY GOSH!!! Just plugged in a node! It's alive! This is the best day of my life!!!

2016-07-17 15:50:05.345 [INFO ] [.b.m.internal.MySensorsBinding] - New MySensor node found: node-id=0
 * Example item: 0;255;I_BATTERY_LEVEL      - Use this to report the battery level 0-100 (%)
 * Example item: 0;255;I_SKETCH_NAME        - Sketch name that can be used to identify sensor
 * Example item: 0;255;I_SKETCH_VERSION     - Sketch version that can be reported to keep track of the version of sensor

[jerseyguy1996]

Awwwww.....good feelings gone :-(

2016-07-17 15:50:54.019 [DEBUG] [.o.b.m.internal.gateway.Serial] - Error writing data on serial port /dev/ttyUSB20: Input/output error in writeArray
2016-07-17 15:50:54.021 [DEBUG] [.b.m.internal.MySensorsBinding] - Ping gateway: Faild, unable to contact gawatay
2016-07-17 15:50:54.026 [DEBUG] [.b.m.internal.MySensorsBinding] - Starting new gateway
2016-07-17 15:50:54.032 [ERROR] [.o.b.m.internal.gateway.Serial] - Unable to find Serial port '/dev/ttyUSB20'

I'm on an emotional roller coaster here. Now I'm back to:

2016-07-17 15:51:54.065 [ERROR] [.service.AbstractActiveService] - Error while executing background thread MySensors Refresh Service
java.lang.NullPointerException: null
	at org.openhab.binding.mysensors.internal.gateway.Serial.write(Serial.java:82) ~[na:na]
	at org.openhab.binding.mysensors.internal.MySensorsBinding.execute(MySensorsBinding.java:178) ~[na:na]
	at org.openhab.core.binding.AbstractActiveBinding$BindingActiveService.execute(AbstractActiveBinding.java:156) ~[na:na]
	at org.openhab.core.service.AbstractActiveService$RefreshThread.run(AbstractActiveService.java:173) ~[na:na]```

[jerseyguy1996]

Checked the PiGatewaySerial.log file and nothing seems out of place. The log for today is simply:

Jul 17 15:38:13 raspberrypi PiGatewaySerial: Starting PiGatewaySerial...
Jul 17 15:38:13 raspberrypi PiGatewaySerial: Protocol version - 1.4
Jul 17 15:38:13 raspberrypi PiGatewaySerial: Created PTY '/dev/pts/0'
Jul 17 15:38:13 raspberrypi PiGatewaySerial: Gateway tty: /dev/ttyMySensorsGateway```

[jerseyguy1996]

Oh! It's working again. I had used the stock eeprom clear sketch in the arduino id to reset my node and I should have used the eeprom clear config sketch in the mySensors examples within the mySensors arduino library to clear the eeprom. I couldn't get it to auto assign a node ID so I just hard coded one using:

  gw.begin(NULL,3);

Then I updated my item to use that node id and voila:

2016-07-17 17:49:17.721 [DEBUG] [.b.m.internal.MySensorsBinding] - internalReceiveUpdate(Temperature,20) is called!
2016-07-17 17:49:17.723 [DEBUG] [.b.m.internal.MySensorsBinding] - Temperature = 20

It's a good day!