ESP32 DIY Emegency Button. Case study. Don't rely on this only.
For more security use multiple channels (i.e. Phone, SMS, Voice, ...).
For GMAIL:
You must turn on access for less secure apps.
http://www.google.com/settings/security/lesssecureapps
Initial Video:
Andreas Spiess - #101 Long lasting DIY "Amazon Dash Button" using an ESP8266
Example Code:
https://github.com/pcbreflux/espressif/tree/master/esp32/app/ESP32_ssl_gmail
Example PCB:
https://github.com/pcbreflux/espressif/tree/master/esp32/kicad/ESP32-HELP-Button
MOSFETs:
http://www.infineon.com/dgdl/irlml2502.pdf?fileId=5546d462533600a401535667f44d2602
http://www.aosmd.com/pdfs/datasheet/AO3406.pdf
http://www.aosmd.com/pdfs/datasheet/AO3402.pdf
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