<![CDATA[LoRa Unit with Antenna (E220) how to wake up?]]>Description explains me :
It utilizes convenient serial communication. It supports point-to-point transmission and broadcast modes, as well as wireless wake-up,

I am curious how that can be done, certainly because pin AUX is not connected.
The documentation for the chip ( E220-400T22S) reads like this :
pin 24
AUX
Output
Used to indicate the working status of the module;
The user wakes up the external MCU and outputs low level during power-on self-check initialization; (can be left floating)

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