# An example flow for control of devices via MQTT - tasmota in this case

**URL:** <https://discourse.nodered.org/t/an-example-flow-for-control-of-devices-via-mqtt-tasmota-in-this-case/74876>\
**Category:** Share Your Projects\
**Created:** [8 February 2023 08:08 UTC](https://discourse.nodered.org/t/an-example-flow-for-control-of-devices-via-mqtt-tasmota-in-this-case/74876 "2023-02-08T08:08:37Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Trying\_to\_learn](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/trying_to_learn/32/28400_2.png) [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)\
**Post date:** [8 February 2023 08:08 UTC](https://discourse.nodered.org/t/an-example-flow-for-control-of-devices-via-mqtt-tasmota-in-this-case/74876/1 "2023-02-08T08:08:38Z")

</div>

# Scenario:

You want to turn a device `ON/OFF` via MQTT.  
In this case it is a power point.  
There is a `button` node to indicate the status.  
There is also an `inject` node to test it from the `edit` screen.

## What happens:

`RED` is `OFF` and `LIME/GREEN` is `ON`.  
`ORANGE` is _I'm changing state_ to make it a bit more _realistic_ in turning ON/OFF.  
Most of the work is done in the `subflow`. **Read the instructions for the subflow**.  
Sorry, I am not a good person with writing docs, but it is fairly simple. I hope what I have put there is good enough.

The `LWT` (and birth certificate) are used to control the icon/switch node status.  
If it device is unplugged, the button/switch/icon is disabled.  
If it is plugged in and working, the button/switch/icon is enabled and usable.

**YOU MUST**  
set the device to be controlled as an `env` variable of the `subflow`.

And also set attributes on the `button` node to match the device's name also.  
As is, it won't work for you. I've included the flow to give you an example of HOW to use the `subflow`.

I'd be interested if you like it.

```auto
[{"id":"94cf2ea396e5b6f6","type":"subflow","name":"MQTT Button Toggle","info":"# 2023 02 08\nAdded status text to icon to \nshow status of device.\n\n# 2023 01 25\nControl MQTT devices (power points)\nwith this node.\n\n`Button` node MUST have `topic` set to include\nthe device's name. eg: `A1/button`\nand the payload MUST be `X`\n\nSet the `Device Name` to (eg) `A1` to\ncontrol `A1` device.\n","category":"","in":[{"x":70,"y":160,"wires":[{"id":"7207fbe19cc07923"}]}],"out":[{"x":990,"y":200,"wires":[{"id":"66fb54e88f4acb8d","port":0}]},{"x":1190,"y":160,"wires":[{"id":"27d2dd9a875ab1a5","port":0}]}],"env":[{"name":"DN","type":"str","value":"","ui":{"label":{"en-US":"Device Name"},"type":"input","opts":{"types":["str"]}}}],"meta":{},"color":"#DDAA99","inputLabels":["MQTT (tele and LWT) and button input"],"outputLabels":["Back to `button` input","MQTT output"],"status":{"x":1070,"y":270,"wires":[{"id":"45a85f7621f5c28f","port":0}]}},{"id":"541720ad73579447","type":"switch","z":"94cf2ea396e5b6f6","name":"what message?","property":"topic","propertyType":"msg","rules":[{"t":"cont","v":"/stat/POWER","vt":"str"},{"t":"cont","v":"/tele/LWT","vt":"str"},{"t":"cont","v":"button","vt":"str"}],"checkall":"true","repair":false,"outputs":3,"x":195,"y":160,"wires":[["61843ca1684f9f9d"],["4788b5265af1d45a"],["5b8cd9fe254ea8d1"]],"l":false},{"id":"61843ca1684f9f9d","type":"delay","z":"94cf2ea396e5b6f6","name":"Delay","pauseType":"delay","timeout":"200","timeoutUnits":"milliseconds","rate":"1","nbRateUnits":"1","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":false,"allowrate":false,"outputs":1,"x":340,"y":80,"wires":[["bdb2c46daf62b36f"]]},{"id":"6d4704f6fc9b98be","type":"change","z":"94cf2ea396e5b6f6","name":"RESET","rules":[{"t":"set","p":"payload","pt":"msg","to":"RESET","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":350,"y":120,"wires":[["bdb2c46daf62b36f"]]},{"id":"4788b5265af1d45a","type":"switch","z":"94cf2ea396e5b6f6","name":"LWT","property":"payload","propertyType":"msg","rules":[{"t":"eq","v":"Online","vt":"str"},{"t":"eq","v":"Offline","vt":"str"}],"checkall":"true","repair":false,"outputs":2,"x":340,"y":160,"wires":[["6d4704f6fc9b98be","bc2aabd04561d534"],["6a82c12953657965"]]},{"id":"6a82c12953657965","type":"function","z":"94cf2ea396e5b6f6","name":"BAN","func":"msg = {icon: '<font color = \"red\"><i class=\"fa fa-ban fa-3x\"></i></font>'};\nreturn msg;","outputs":1,"noerr":0,"x":340,"y":200,"wires":[["8dc8a0dd2b669ae3","704ae850657c9724"]]},{"id":"bc2aabd04561d534","type":"change","z":"94cf2ea396e5b6f6","name":"Enable","rules":[{"t":"set","p":"enabled","pt":"msg","to":"true","tot":"bool"},{"t":"set","p":"ARLEC-1","pt":"flow","to":"ONLINE","tot":"str"},{"t":"delete","p":"payload","pt":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":540,"y":160,"wires":[["66fb54e88f4acb8d"]]},{"id":"bdb2c46daf62b36f","type":"function","z":"94cf2ea396e5b6f6","name":"Set state","func":"let device = msg.topic.split(\"/\");\n//node.warn(\"Device \" + device[0]);\n//node.warn(\"Payload \" + msg.payload);\n\nif (msg.payload == \"RESET\")\n{\n let state = context.get(device[0]);\n if (state === 0)\n {\n //\n msg= {\"icon\": '<font color = \"red\"><i class=\"fa fa-toggle-on fa-rotate-270 fa-3x\"></i></font>',\"background\":\"black\"};\n return msg;\n }\n //\n}\nif (msg.payload == \"ON\")\n{\n msg = { \"icon\": '<font color = \"lime\"><i class=\"fa fa-toggle-on fa-rotate-90 fa-3x\"></i></font>', \"background\": \"black\" };\n context.set(\"STATE\",1);\n context.set(device[0],1);\n} else\n{\n msg = { \"icon\": '<font color = \"red\"><i class=\"fa fa-toggle-on fa-rotate-270 fa-3x\"></i></font>', \"background\": \"black\" };\n context.set(\"STATE\",0);\n context.set(device[0], 1);\n}\nreturn msg;\n","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":540,"y":120,"wires":[["66fb54e88f4acb8d"]]},{"id":"8dc8a0dd2b669ae3","type":"change","z":"94cf2ea396e5b6f6","name":"Disable","rules":[{"t":"set","p":"enabled","pt":"msg","to":"false","tot":"bool"},{"t":"set","p":"ARLEC-1","pt":"flow","to":"OFFLINE","tot":"str"},{"t":"delete","p":"payload","pt":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":540,"y":200,"wires":[["66fb54e88f4acb8d"]]},{"id":"5b8cd9fe254ea8d1","type":"function","z":"94cf2ea396e5b6f6","name":"Button control","func":"let msg1 = {};\n\nlet x = msg.payload;\nlet counter = context.get(\"counter\") || 0;\nif (x == \"X\")\n{\n counter = (counter + 1) % 2;\n context.set(\"counter\",counter);\n if (counter === 0)\n {\n //\n msg.payload = \"OFF\";\n msg1 = {\"icon\": '<font color = \"orangered\"><i class=\"fa fa-toggle-on fa-rotate-270 fa-3x\"></i></font>',\"background\":\"black\"};\n\n } else\n {\n //\n msg.payload = \"ON\";\n msg1 = {\"icon\": '<font color = \"orangered\"><i class=\"fa fa-toggle-on fa-rotate-90 fa-3x\"></i></font>',\"backgound\":\"black\"};\n }\n}\nif (x == \"ON\")\n{\n // Force power ON\n msg.payload = \"ON\";\n msg1 = { \"icon\": '<font color = \"orangered\"><i class=\"fa fa-toggle-on fa-rotate-90 fa-3x\"></i></font>', \"backgound\": \"black\" };\n context.set(\"counter\",1);\n}\nif (x == \"OFF\")\n{\n // Force power OFF\n msg.payload = \"OFF\";\n msg1 = { \"icon\": '<font color = \"orangered\"><i class=\"fa fa-toggle-on fa-rotate-90 fa-3x\"></i></font>', \"backgound\": \"black\" };\n context.set(\"counter\",0);\n}\n\nreturn [msg,msg1];","outputs":2,"noerr":0,"initialize":"","finalize":"","libs":[],"x":750,"y":120,"wires":[["4f29a481b6f0d0e3","0ae8f43ccf9a1016"],["66fb54e88f4acb8d"]]},{"id":"4f29a481b6f0d0e3","type":"delay","z":"94cf2ea396e5b6f6","name":"Delay","pauseType":"delay","timeout":"100","timeoutUnits":"milliseconds","rate":"1","nbRateUnits":"1","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":false,"outputs":1,"x":1040,"y":120,"wires":[["27d2dd9a875ab1a5"]]},{"id":"27d2dd9a875ab1a5","type":"change","z":"94cf2ea396e5b6f6","name":"#1","rules":[{"t":"set","p":"topic","pt":"msg","to":"DN","tot":"env"},{"t":"set","p":"topic","pt":"msg","to":"topic&'/cmnd/power1'","tot":"jsonata"}],"action":"","property":"","from":"","to":"","reg":false,"x":1040,"y":160,"wires":[[]]},{"id":"7207fbe19cc07923","type":"switch","z":"94cf2ea396e5b6f6","name":"Only for this device","property":"topic","propertyType":"msg","rules":[{"t":"cont","v":"DN","vt":"env"}],"checkall":"true","repair":false,"outputs":1,"x":135,"y":160,"wires":[["541720ad73579447"]],"l":false},{"id":"0ae8f43ccf9a1016","type":"function","z":"94cf2ea396e5b6f6","name":"Identify","func":"let dev = env.get(\"DN\");\nlet status = msg.payload;\n\nnode.status(dev + \" \" + status);","outputs":1,"noerr":0,"initialize":"// Code added here will be run once\n// whenever the node is started.\nnode.status(env.get(\"DN\"));\n","finalize":"","libs":[],"x":540,"y":270,"wires":[[]]},{"id":"45a85f7621f5c28f","type":"status","z":"94cf2ea396e5b6f6","name":"","scope":["0ae8f43ccf9a1016","f9f07adecaa02241"],"x":770,"y":270,"wires":[[]]},{"id":"704ae850657c9724","type":"change","z":"94cf2ea396e5b6f6","name":"Wipe status when unplugged","rules":[{"t":"set","p":"payload","pt":"msg","to":" ","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":305,"y":270,"wires":[["0ae8f43ccf9a1016"]],"l":false},{"id":"66fb54e88f4acb8d","type":"junction","z":"94cf2ea396e5b6f6","x":680,"y":200,"wires":[[]]},{"id":"86852c080f02187b","type":"mqtt in","z":"6dd5ca4d.d1958c","g":"08979a5b752f5e66","name":"","topic":"A1/stat/POWER","qos":"2","datatype":"auto-detect","broker":"bbf26a6c.b7922","nl":false,"rap":true,"rh":0,"inputs":0,"x":3990,"y":3120,"wires":[["f29f3ae3ad90c065"]]},{"id":"1e39d8c837d7b2fb","type":"mqtt in","z":"6dd5ca4d.d1958c","g":"08979a5b752f5e66","name":"","topic":"A1/tele/LWT","qos":"2","datatype":"auto-detect","broker":"bbf26a6c.b7922","nl":false,"rap":true,"rh":0,"inputs":0,"x":4000,"y":3170,"wires":[["f29f3ae3ad90c065"]]},{"id":"61ee633777cbbe4d","type":"link in","z":"6dd5ca4d.d1958c","g":"08979a5b752f5e66","name":"Button","links":["c2f5a62f6628cf5f","9b45b54a54fd7017"],"x":4055,"y":3210,"wires":[["f29f3ae3ad90c065"]]},{"id":"f29f3ae3ad90c065","type":"subflow:94cf2ea396e5b6f6","z":"6dd5ca4d.d1958c","g":"08979a5b752f5e66","name":"","env":[{"name":"DN","value":"A1","type":"str"},{"name":"Device name","value":"A1","type":"str"}],"x":4200,"y":3170,"wires":[["9ba2764071e69ef2"],["a468b0cde187f892","4acfea6a575732bb"]]},{"id":"c42bfcfaec6f1e40","type":"inject","z":"6dd5ca4d.d1958c","g":"08979a5b752f5e66","name":"Button","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"A1/button","payload":"X","payloadType":"str","x":4410,"y":3100,"wires":[["9b45b54a54fd7017"]]},{"id":"9ba2764071e69ef2","type":"ui_button","z":"6dd5ca4d.d1958c","g":"08979a5b752f5e66","name":"A1","group":"5dde4bf66eb38aa1","order":1,"width":"1","height":"1","passthru":false,"label":"{{msg.icon}}","tooltip":"","color":"","bgcolor":"{{msg.background}}","className":"","icon":"","payload":"X","payloadType":"str","topic":"A1/button","topicType":"str","x":4410,"y":3140,"wires":[["9b45b54a54fd7017"]]},{"id":"a468b0cde187f892","type":"mqtt out","z":"6dd5ca4d.d1958c","g":"08979a5b752f5e66","name":"","topic":"","qos":"","retain":"","respTopic":"","contentType":"","userProps":"","correl":"","expiry":"","broker":"bbf26a6c.b7922","x":4410,"y":3180,"wires":[]},{"id":"9b45b54a54fd7017","type":"link out","z":"6dd5ca4d.d1958c","g":"08979a5b752f5e66","name":"link out 3","mode":"link","links":["61ee633777cbbe4d"],"x":4505,"y":3140,"wires":[]},{"id":"bbf26a6c.b7922","type":"mqtt-broker","name":"TIMEPI MQTT","broker":"192.168.17.39","port":"1883","clientid":"","autoConnect":true,"usetls":false,"compatmode":false,"protocolVersion":"4","keepalive":"60","cleansession":true,"birthTopic":"SOM","birthQos":"0","birthRetain":"false","birthPayload":"BedPi Comms UP","birthMsg":{},"closeTopic":"EOM","closeQos":"0","closeRetain":"false","closePayload":"BedPi Shutting DOWN","closeMsg":{},"willTopic":"EOM","willQos":"0","willRetain":"false","willPayload":"BedPi COMMS FAILURE","willMsg":{},"userProps":"","sessionExpiry":""},{"id":"5dde4bf66eb38aa1","type":"ui_group","name":"A(1-4) Sockets","tab":"e92ac76d.c24e7","order":12,"disp":true,"width":"4","collapse":false,"className":""},{"id":"e92ac76d.c24e7","type":"ui_tab","name":"Real_World_Control","icon":"dashboard","order":7,"disabled":false,"hidden":false}]

```