Sleep mode - counter during sleep

[ScruffR]

@ninjatill

And considering that the sleep modes only wake with the WKP pin

Sleep modes - plural?
Deep sleep (aka Standby sleep) and its different flavours is hard wired to WKP. However, Stop Mode sleep does allow other - even multiple - pins.

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This discussion should be continued on the new tread

LPTIM Timer- Counter on Sleep for Rain Gauge

I work in a Remote Rain Gauge Project.A switch produces pulses (mm of rain). I develop a code for the Electrón using a interrupt in D2 pin and send the data every 15 minutes. I need to improve the battery life, the STM32 micro have a LPTIM(low power timer ) would be used to count external pulses in sleep mode. I looking for some code in particle comunnity without exit. I realy apprecciate any help. Thanks in advance