NetXMS Support Forum

Hi
I run into config problems with OneWire Sensor.
The subAgent is loading but always got the message:

2019.11.12 07:47:00.477 *W* Unable to add sensor from configuration file. Original configuration record:
2019.11.12 07:47:00.478 *I* Subagent "DS18X20" (ds18x20.nsm) loaded successfully (version 2.2.8)


The sensor is working and I got some temperatures from it:

:/sys/bus/w1/devices/28-0000022801e4# cat w1_slave
35 01 4b 46 7f ff 0b 10 31 : crc=31 YES
35 01 4b 46 7f ff 0b 10 31 t=19312


The config looks like this, but tried some other things more by try-and-error:

SubAgent = ds18x20.nsm

# 1Wire Seonsors
[DS18X20]
Sensor = Test:28-0000022801e4


Are there anybody who can provide a working "config" or has hints of that issue?
A higher debug level don´t tell me more informations about the config problem.

Thank you guys for your help!

Hi!

Let me describe the whole configuration process for DS18x20 sensors on RPi in case if someone needs this later.
1) A pull-up resistor of 2..10KOhm should be connected between DQ pin of the sensor and +3.3v. GPIO2 and GPIO3 have built-in 1.8KOhm pull-up resistors (at least on RPi 3), so if you don't need I2C, you can connect the sensor to one of these pins.
2) A kernel module is used to communicate with the sensor. It is activated ty adding dtoverlay=w1-gpio to the end of /boot/config.txt file.
By default the DQ pin of the sensor should be connected to GPIO4, to use another GPIO the following format could be used: dtoverlay=w1-gpio,gpiopin=3. Reboot RPi when finished editing the file.
Since kernel version 4.9.28 it's also possible to use dynamic overlay loading: sudo dtoverlay w1-gpio gpiopin=5, in this way it's possible to have sensors on several GPIO pins.
3) After restart (of after dynamic overlay loading) the sensors should get detected:
root@raspberrypi:~# ls  /sys/bus/w1/devices/
28-6cb0611f64ff  w1_bus_master1

here we have one sensor connected, it has name 28-6cb0611f64ff
4) And we should be able to read the temperature:
root@raspberrypi:~# cat /sys/bus/w1/devices/28-6cb0611f64ff/w1_slave
78 01 55 00 7f ff 0c 10 57 : crc=57 YES
78 01 55 00 7f ff 0c 10 57 t=23500

which in this case is 23,5 degrees C.
5) To configure NetXMS agent we add the following lines to /etc/nxagentd.conf
SubAgent=ds18x20.nsm

[DS18X20]
Sensor = Test:28-6cb0611f64ff

6) After agent restart systemctl restart nxagentd our parameter "Test" should return the temperature.
user@netxms-server:~$ nxget raspberrypi.lan 'Sensor.Temperature(Test)'
23.312



Your configuration looks exactly the same. The thing is that the error message in agent log "Unable to add sensor from configuration file. Original configuration record:" looks to be a bug, i am also getting it (as of v. 3.1.274). But the parameter works. Most probably on your system Sensor.Temperature(Test) will also give the result.