NodeRED Flow to check Emoncms feeds for inactivity

glyn.hudson · 15 May 2017 22:15

Here is a quick NodeRED flow to check a feed on emoncms.org for inactivity ie. stopped updating. The application I needed this for is to ensure a local hydro system that we are monitoring via GSM 3G connection does not drop offline while we’re still debugging the 3G connectivity.

I’ve set up the flow to check a certain feed on Emoncms.org (defined by feed ID) every 30min, if it has not updated in this time since the last check the flow sends me an email. Tweak the parameters to suit your application.

github.com

openenergymonitor/oem_node-red/blob/master/check-emoncms-inactive-feeds.json

[
  {
    "id": "7c73772b.473a48",
    "type": "function",
    "z": "36f4d48.473412c",
    "name": "Check to see if feed has been updated since last check",
    "func": "var new_update = msg.payload.time;\n\nvar old_update = global.get(\"old_update\");\n\nif (new_update == old_update){\n    \/\/ if feed has not been updated the new update\n    \/\/ time will equal the old update time\n    \/\/ payload is returned if feed has NOT BEEN UPDATED\n    return {payload: 'Emoncms feed ' + msg.payload.id + ' called \\'' + msg.payload.name + '\\' has not updated since ' + msg.payload.time + ' UTC'};\n}\n\nglobal.set(\"old_update\",new_update);\n",
    "outputs": 1,
    "noerr": 0,
    "x": 338,
    "y": 275,
    "wires": [
      [
        "ae6c3d89.c73bd",
        "ea8deedf.86155"
      ]
    ]
  },
  {
    "id": "123ea097.541e9f",

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jeremypoulter · 16 May 2017 11:25

Thanks, been meaning to implement this for ages… Will give it a try.