This driver does not implement all available AT commands of the SIM7020 modem. It's enough though, to check the connectivity, get time stamps and send data via HTTP and MQTT.
Check the pico example for a basic example. I used the raspberrypi Pico (rp2040) along with the header board from Waveshare and a sim card from 1nce.
Enable async support through the non-blocking feature flag. This is WIP. Checkout the embassy pico example.
Feel free to open an issue if you need support for specific other functionality.