Is UART necessary to send AT-commands to Bluetooth module?

I’m looking to alert a connected device over Bluetooth when an accelerometer detects motion. I’m thinking of using the HM-10 Bluetooth module and an ATtiny for controlling the accelerometer.

The doc says that AT-commands can only be sent via UART. Does that mean the ATTiny will need to have an UART port? Could an ATtiny45 be used instead?

Thanks