Using this template it's possible to record 434Mhz signals, write them to a Sqlite DB, and then perform any scripted action (including SMS)
HackRF One
YARD Stick One
Raspberry Pi 3 Kit
RXB6 433Mhz
434Mhz Motion Sensor
434Mhz Door Sensor
apt install sqlite3 python-pip
pip install twilio Flask
Email me: 434 AT eescobar DT com