Change float value

General
1

Hi,

i want to convert values that I read from my PV system and receive as e.g. fl_450FF801 so that a correct value is displayed. fl_450FF801 should become something like 0.34 kW.
How can i change this values and what means fl_ is it a float value? and to which value must i change it to become the real values behind it? same with value u8, what to do with this value?
i read many topics here but didn't find the right solution, if it's already there please tell me where to find it :wink:

values

Thanks for your help, regards, Andre

2

It would help if you told us the make and model of the device. What does the manual say about values?

3

Hi Steve,

its a SENEC Home v3 and i got these values from an website (http://ipaddress/lala.cgi):

senec
senec900×563 38.1 KB

senec2
senec21185×798 42.9 KB

i want to work with the values and automat something...

4

This page gives info on types Query the hidden API of your SENEC photovoltaic appliances
According to this site this should work] for fl_ and u8_

msg.payload.fl = Buffer.from("fl_42A2E5E4".split("_")[1], 'hex').readFloatBE() // fl_
msg.payload.u8 = Buffer.from("u8_64".split("_")[1], 'hex').readUInt8() //u8_

Test flow

[{"id":"18144789e95d8588","type":"inject","z":"366a43adb328cf95","name":"","props":[{"p":"payload"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"{\"fl\":\"fl_450FF801\",\"u8\":\"u8_64\"}","payloadType":"json","x":110,"y":460,"wires":[["8a5128bec0bd3db6"]]},{"id":"aefc713a35661715","type":"debug","z":"366a43adb328cf95","name":"debug 11","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","statusVal":"","statusType":"auto","x":920,"y":380,"wires":[]},{"id":"8a5128bec0bd3db6","type":"function","z":"366a43adb328cf95","name":"function 11","func":"msg.payload.float = Buffer.from(msg.payload.fl.split(\"_\")[1], 'hex').readFloatBE() // fl_\nmsg.payload.uint = Buffer.from(msg.payload.u8.split(\"_\")[1], 'hex').readUInt8() //u8_\n\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":310,"y":500,"wires":[["aefc713a35661715"]]}]
5

Hi E1cid, thanks for your help, ok that worked for me.. but only if i have a fixed value in this function node, how can i change this to a variable..

i tried:
msg.payload.fl = Buffer.from("msg.payload.ENERGY.GUI_HOUSE_POW".split("")[1], 'hex').readFloatBE() // fl

but this didn't work?

6

Try without quotes

msg.payload.fl = Buffer.from(msg.payload.ENERGY.GUI_HOUSE_POW.split("_")[1], 'hex').readFloatBE()
7

small mistake big effect :wink:

Now it's working, thanks so much.

8

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