Heltec LoRa Wif problems

[Maddesh]

Hey guys!
Im kind of new to LoRa and microcontrollers, but I am trying to work into a project:

I try to collect Data from a smart meter using an Heltec WiF LoRa 32. To give the node a decent lifetime i wanted to use the deep sleep - but it actually is not working properly if you can believe the very very low powerconsumption in the data sheets.

If I power the ESP32 externally and measure the voltage via an oszilliscope, i get the following voltage (see upoaded picture)

1ohm_1Periode.PNG (29.93 KiB) Viewed 2303 times

Every 4 secs the ESP32 is waking up due a external wake-up. After this, he reads the serial port, where the data from the smart meter is inserted. After reading the Data he is sending via LoRa and then he should go to sleep.

I hope I could make clear what I am trying to do

Is there someone who can help me figuring out how to fix the deep sleep mode? I am wondering, that the LoRa module is powered so long. I got a transmission time for my data of 17ms, but the module is powering arround 700ms before going off.

Thank you!!

Best regards,
Matthias