Hi, i cant connect the square xiaomi sensors.
I downloed the app: https://ru.kapiba.ru/mihome/files/old/MiHome_5.6.65_63005_vevs.apk
Then i add my new temp sensors in the app, but i don’t know what have to do now or where can i find de file with de keys of the sensors 
Thanks and sorry for my bad english
This sensor is now supported by OpenMQTTGateway on ESP32 based boards.
The data are retrieved every 10 minutes by default.
No password needed, once the firmware is flashed the values are retrieved.
[EDIT] LYWSD03MMC is also supported by OpenMQTTGateway with the ATC custom firmware. This way you get the values more frequently and with no impact on device battery life.
TIP: Getting the bind key for the Xiaomi Mijia LYWSD03MMC sensor
I suspect this is is a silly question, but is it ok to delete the custom Vevs app once the bindkeys have been discovered, the YAML config updated and the sensors are reporting successfully in HA?
For sure - once the bind keys are in place, you can delete the said apps.
Hello! Can you share the config? I managed to connect esphom. Now I am trying to implement it in hasio.
If someone is interested in a pure shell solution: https://github.com/belkop-ghb/LYWSD03MMC. Data are read by a cronjob and posted to MQTT.