Wireless to Ethernet Modems

Pitmaster · September 27, 2019, 1:49pm

I have numerous (~25) Wireless Temperature / Humidity Sensor nodes all pointed to a single NCD Wireless to Ethernet modem. I am getting this message every ~0.10 seconds in the terminal window. When I had started adding nodes this didn’t start happening until I had a larger number of nodes in the flow (just an observation, perhaps not related).

{ Error: connect ECONNREFUSED 10.0.1.185:2101
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1106:14)
errno: ‘ECONNREFUSED’,
code: ‘ECONNREFUSED’,
syscall: ‘connect’,
address: ‘10.0.1.185’,
port: 2101 }

Below is a flow that I have copied and edited for each specific node, changing, the specific information for each node (MAC address along with other basic information - names, gauge stuff, etc.) Also you can ignore the SQL node for now as I thought this issue may have been related to that, but after clearing out all the SQL nodes there was no change. Also you can ignore the email node as I have it incomplete so Im not getting blasted with temp/humid. alarms during this setup process.

Running node-red on Ubuntu Client 18.04.3 LTS. Node-Red version v0.20.8, Node.js version: v10.16.3


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Alert in Room 27 (Washroom 2)!","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":1311,"y":249,"wires":[["6d8e4f34.403708","8dc0d8c4.e9f588"]]},{"id":"939631e1.b517b8","type":"change","z":"e1f6a792.4ccff","name":"","rules":[{"t":"set","p":"topic","pt":"msg","to":"Low Temp. 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Acceptable is 50F","format":"","layout":"row-left","x":1366.0000457763672,"y":314,"wires":[]},{"id":"82b2b9de.905ec8","type":"MSSQL","z":"e1f6a792.4ccff","mssqlCN":"","name":"MSSQL","query":"INSERT INTO [temperaturehumidity] (temp,humidity,nodeID,voltage,SensorName,InAlarm) VALUES ({{{payload.temperature}}}*1.8+32,{{{payload.humidity}}},{{{data.nodeId}}},{{{data.battery}}},'Washroom 2 (Sanitation) Temp/Humid Sensor','{{{flow.inalarm}}}')","outField":"payload","returnType":"0","throwErrors":"0","x":782.9999847412109,"y":529.0000152587891,"wires":[[]]},{"id":"ab6ee7d5.02abb","type":"delay","z":"e1f6a792.4ccff","name":"1 msg / 30 minutes","pauseType":"rate","timeout":"5","timeoutUnits":"seconds","rate":"1","nbRateUnits":"30","rateUnits":"minute","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":true,"x":1601,"y":889,"wires":[["3aa52487.e26334"]]},{"id":"2ad09763.ded33","type":"ncd-gateway-config","z":"","name":"10.0.1.185","comm_type":"tcp","ip_address":"10.0.1.185","tcp_port":"2101","port":"","baudRate":"115200","pan_id":"7FFF","rssi":false},{"id":"913d8cd6.91de98","type":"ui_group","z":"","name":"Temperature","tab":"2b781833.48d438","order":2,"disp":false,"width":"5","collapse":false},{"id":"26dc1ec3.4c88da","type":"ui_group","z":"","name":"Humidity","tab":"2b781833.48d438","order":3,"disp":false,"width":"5","collapse":false},{"id":"2b781833.48d438","type":"ui_tab","z":"","name":"Room 27 - Washroom 2","icon":"dashboard","order":22,"disabled":false,"hidden":false}]

jacob · September 27, 2019, 2:45pm

Does the modem you’re connecting to have a static IP address?

Connection refused triggers when a program can’t connect over TCP. Generally due to a change in IP address, an inelegant closing of the original socket when no timeout is set, or something else currently has the socket open.

Pitmaster · September 27, 2019, 2:49pm

The modem does have a static IP addressed assigned.

jacob · September 27, 2019, 3:05pm

Does a reboot of the modem allow the socket to connect?

Does any sensor data come through?

Pitmaster · September 27, 2019, 3:11pm

Reboot of the modem doesn’t appear to do anything. Sensor data is coming through just fine.

Also, I had node-red and node.js running on a windows app server before I moved it to Ubuntu and was having the same issue.

jacob · September 27, 2019, 3:40pm

Interesting, can you check your configuration nodes and see if you have multiple instances of either an ncd-comm or ncd-gateway-config? If there are multiple config nodes trying to connect in the background it would spit out a message like this.

Pitmaster · September 27, 2019, 3:46pm

No multiple instances that I can find…

Pitmaster · September 27, 2019, 4:09pm

Interesting…I saw this error pop up after I did a redeploy on the flows…

27 Sep 11:08:05 - [error] [ncd-wireless-node:5507c638.0cefe8] TypeError: Cannot read property ‘gateway’ of null
27 Sep 11:08:05 - [error] [ncd-wireless-node:4102c727.54a068] TypeError: Cannot read property ‘gateway’ of null

Pitmaster · September 27, 2019, 4:26pm

Disregard the prior reply. I see that error is because I do not have two nodes set to the wireless-ethernet modem

jacob · September 27, 2019, 4:39pm

I believe that’s generally triggered by a misconfigured node.

Well, it sounds like it could be a code issue at this point if everything is working fine, I’ll set up a test. I don’t have a Linux box, but I’ve got a Mac so it should treat the connections about the same.

It might take a while depending on if i can track down an Ethernet Modem.

Pitmaster · September 27, 2019, 4:42pm

Jacob,

So with node-red running I unplugged the power from the ethernet modem and plugged it back in. The error message stopped spamming in the terminal and things seemed to function fine in node-red. I then did a redeploy of the flows and the error didn’t show up again. I then restarted node-red from the terminal and the error popped back up and terminal was getting spammed again.

I can duplicate this issue each time.

jacob · September 27, 2019, 5:02pm

Thanks for the additional information. Definitely sounds like a code issue. I’ll take a look today, but it might take until early next week to get fixed depending on the scope of the issue.

Pitmaster · September 27, 2019, 6:28pm

Sounds good. Thanks for the help.

jacob · September 27, 2019, 9:42pm

Unfortunately I cannot reproduce the issue.

The only way I can trigger the ECONNREFUSED error is to open the socket to the modem in another program.

You stated you had Node-Red running on another server, could you make sure this server is down?

Also add a debug into your flow and make sure that the data is coming through specific flows.

Pitmaster · June 17, 2020, 12:45pm

An old post I know, but I am taking some time to setup a dedicated server for this effort. Upon getting everything setup added one flow to node-red, started the flow and no ECONNREFUSED error. I made a slight change to the flow (dragged some nodes around to make them more visually appealing), redeployed and bam! the ECONNREFUSED error pops back up. I can duplicate this everytime:

stop node-red in the terminal
restart the flow in the terminal (no ECONNREFUSED error)
redeploy the one flow I have in node-red (ECONNREFUSED error appears in terminal)

There is no other program / instance of node-red / modem that I am connecting to to get this node info. node -> modem -> node-red

Any thoughts would be appreciated.