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sand root
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That doesn't seem to work

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This is my flow:

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This gives back these debug messages:

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26/1/2023 20:59:36node: debug 2
msg.payload : string[170]
"SER=0009a7<br>↵TS=1674763149<br>↵TS_R=174168<br>↵PRES=0<br>↵HR=0<br>↵HR_DM=0<br>↵RR=0.0<br>↵RR_DM=0<br>↵ACT=0<br>↵ACT_DM=0<br>↵FW=t120 v2.2.1↵<br>↵END=1<br>↵"

somber hare
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in the change node change the field type of Search for to regex

sand root
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Then the Presence value seems to be gone

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"SER=0009a7<br>↵TS=1674763612<br>↵TS_R=174631<br>↵0↵HR=0<br>↵HR_DM=0<br>↵RR=0.0<br>↵RR_DM=0<br>↵ACT=0<br>↵ACT_DM=0<br>↵FW=t120 v2.2.1↵<br>↵END=1<br>↵"

somber hare
sand root
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I replaced it with your config but still full output

somber hare
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try a fucntion node

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const regex = /PRES=(\d+)<br>/;
const matches = msg.payload.match(regex);
msg.payload = Number(matches[1]);
return msg;
sand root
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woootttt that works

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26/1/2023 21:27:02node: debug 83
msg.payload : number
1

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this is awesome ! Thank you !

sand root
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works very nicely