Telnet output from geiger counter

Developing Nodes
1

Hello,
I have a geiger counter which is outputting a telnet stream as follows:
CPS, 1, CPM, 13, uSv/hr, 0.07, SLOW
CPS, 0, CPM, 13, uSv/hr, 0.07, SLOW
CPS, 0, CPM, 13, uSv/hr, 0.07, SLOW
CPS, 0, CPM, 13, uSv/hr, 0.07, SLOW
CPS, 0, CPM, 13, uSv/hr, 0.07, SLOW
CPS, 0, CPM, 13, uSv/hr, 0.07, SLOW

There is no logon required just a connection to port 23
I’m not a programmer but have used node-red with some other sensors, sending data to emoncms for display. This, with much great help from the forum.
I don’t know how to set this up to capture the data. Looks like it should be simple but I haven’t figured it out yet. There is also an http stream on port 81 but I’m equally stumped on that.
Thanks in advance.
BG

2

Have you tried the TCP in or request node set to port 23?

1 Like
3

Yes, thanks, I tried both but it didn’t connect. I guess I wasn’t setting it up correctly. Node-red is running on the rpi where I want to receive the data 192…176 and the telnet is running on an esp32 192…100:23. Do I need to send something to the source to start it? When I open a telnet session from a terminal then it starts sending automatically, no id or pw. Seems like this should be easy but somewhere I’m missing something.

4

I think you need to send a helo message but it has been a VERY long time since I had to do anything with raw telnet.

As an alternative, you can probably use an exec node to run telnet and get the output?

5

Since you are able to use telnet from the command line, you might try node-red-contrib-telnet-client.

[EDIT] My bad! These nodes loaded correctly in an earlier version of NR but seem to have a problem in the current one. I will look to see whether there is an easy fix.

6

Thanks, I tried to install but no luck. Seems to be there but not showing up in the list of nodes.

7

Did you restart the server and refresh the browser page ?

8

Duh! It needed the browser refresh.

9

I rebooted everything and cleared the browser but no luck so far. Maybe I didn’t install it properly…?

10

Some success in that after several restarts and reboots I have the telnet module installed and the nodes are showing under “network” in the left column.
However, trying various telnet nodes I am unable to connect with the host. There must not be an id/pw requirement as I can go from the command line telnet directly into the stream on port 23. Is there some sort of character that needs to be sent to connect? I haven’t been able to create a flow that deploys with a successful connection. Anyone have any suggestions here? Thanks in advance.
Cheers,
bgrattan@umw.edu

11

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