Hi,
Via TCP communication I'm receiving buffer of HEX data about real temperature of 16 devices.
To show value I must recalculate via function. Is it necessary have a special function for each one or is possible have one function for all ?
First I'm using buffer parser :
What is the calculation in the function?
Yes - share your flow and I will show you how.
Also, include sample data (add a debug node to TCP node, capture the data using the "copy value" button that appears under your mouse pointer when you hover over the payload)
There’s a great page in the docs that will explain how to use the debug panel to find the right path to any data item.
Pay particular attention to the part about the buttons that appear under your mouse pointer when you over hover a debug message property in the sidebar.
In order to make code readable and usable it is necessary to surround your code with three backticks (also known as a left quote or backquote ```)
```
code goes here
```
See this post for more details - How to share code or flow json
Here is a flow
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and values
first answer
[255,255,16,23,255,255,141,255,129,141,141,255,255,129,143,143,143,143,143,141,141,141,0,0,151,221]
second answer after 5sec
[255,255,16,23,255,255,13,31,12,14,14,31,31,18,16,15,15,15,15,13,13,15,0,0,148,190]
is it all what you need ?
Thanks
Alex
Been busy with bugs etc. Will respond soon.
no problem. Thanks a lot for help
Hi, while I cannot quite see how your logic works (i suspect there are existing issues) I can offer you a more manageable way to work by using single (re-usable) functions (via LINK CALL) and show you how to name the values for better debugging and understanding.
Your flow...
This is the my modifications
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Your function code was doing unnecessary hula hoops to convert a number into a number. Simply chose the number type in buffer parser and it will give you that number...
And this is the output...
Note the values are actual numbers (no need to do conversions in functions) Note also the "copy path" button under the mouse? - use that to get the path to any value e.g. msg.payload.room3POT
Thank you. There is missing "link call". I think must be installed additionaly.
no, you must be using OLD version of node-red.
node -v in console / terminal or see info in start up log)
upgrade ? not sure if it's possible
updated to other hw and new version of node red. now link call is working, but there is comlepte wrong calculation in first answer - status is calculated but not POT. Mising this functions :
pot calculation :
understand what's missing ? I'm using first five bits for POT (requested temperature) calculation and next3 bits are status. It's completly missing in your code. My posted code was fully working. RT flow reads realtime value. POT flow reads requested value and status. Status is showed, requested value is showed and realtime values is showed with color calculated by comparison.
Like i said, I was uncertain of how / waht you were attempting to calculate - I re-aranged your flow to RE-USE functions.
If you are still struggling, post your flow (as it is now) with a description of what values are supposed to be calculated (and how).
Also, provide REAL sample data in via an inject node (like I did in my demo flow) since I don't have your device to generate my own real TCP data
Sending flow again
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That looks like the original flow you posted first time and contains NONE of the extensive tidy up from my earlier reply above (How to process multiple data - #7 by Steve-Mcl)
Your old (bad) conversion code is back, the buffer parsers are still outputting hex to individual outputs, none of the Link Call stuff is there
Nor does your flow contain any injects with real data.
Upper line Real values :
receiving :
[255,255,16,23,255,255,13,31,5,15,15,31,31,18,17,17,16,17,17,15,15,14,0,0,238,182]
and parse 16 values of real temperature values (in shared flow only 3 to make it more simple).
lower line requested values and status:
receiving :
[255,255,16,23,255,255,141,255,129,143,143,255,255,159,145,145,145,145,145,143,143,141,0,0,199,221]
and parse also 16 values, but first 5bits of each value is requested temperature - I calculate with function "room1POT" and last 3bits is status which I calculate with function "room1status"
Temperature from function "room1POT" I'm comparing with RT temperature by function "Cmp.RT/POT" which sets a colort for text message
I wasn't able improve my code, because I fully don't understand your improvement, because your code is I think complete wrong. Missing bits operations to calculate status and requested temperature.
Also not understand what is calling what.
Here is an updated version of your code using LINK CALLs to reduce code copying.
You might not understand it right away but you CAN figure it out & when you do you will realise the concepts I used can be easily built upon.
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Thank you for your patience. I spent complete afternoon (and will continue) with your code 
because then I have problem understand next operation
before and after this set I see :
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