How to sum many messages (numbers) that's arrive from one node

Hello this is me Badr I'm student I tried many time to sum the messages that I arrive them from the same node
For example I'm sending the temperature value 25° after a while mints the temperature become 30 so I need to add the second value that I arrived it (30) to the first value which is (25) to become the output value (55). After this when I arrive different value for example 35 it will add to the last value 55 to be the output 55+20= (((75)))
so when I arrive message it will add to the last value that I got
please help me to do the function that sum the values is arriving to the gauge.
I will I appreciate your help.

You would need to store the sumed value in context storage

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Thank you so much it helps me. ^_^.

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