https://github.com/nayarsystems/virkey
Use cases
Garage door opener.
Safe switch.
Clocking machine.
Main characteristics
Asymmetric encryption algorithm (libsodium)
Unlimited users per device.
Over-the-Air (OTA) firmware updates. The updates are transparent through users normal utilization. For example, when users open a garage door they send firmware chunks transparently. When all chunks are received, Virkey hardware switches to new firmware version. This feature is crucial to fix potential security or functionality flaws.
Supports complex time restriction rules.
Android and iOS app (they are free but not open-source right now).
Supported ESP32 boards
OLIMEX ESP32 EVB
DIYMALL RELAY32
ARMTRONIX QUAD RELAY
REMOTSY DEVELOPER RELAY
TTGO MINI 32 (with relay shield)
TTGO T8