@volberg.bsky.social "Connect" to BeiDou? Isn't BeiDou the Chinese equivalent of GPS and GLONASS? These systems transmit signals one way only. From the satellites towards the Earth. You don't "connect" to a GPS satellite system either. You just *listen* to signals from the satellites.
In earlier reports of this I read that the buses had mobile data radio, like mobile phones, that used plain SIM cards, IIRC ones from Romanian operators, and likely use that to be *connected* to the manufacturer. Has somebody pulled the BeiDou aspect out of thin air?
https://www.skylabmodule.com/comprehensive-understanding-of-beidou-short-message-communication/
3 W transceiver
The Beidou system integrates Beidou short message communication with the characteristics of mixed constellations and system advantages to achieve integrated communication and navigation. The Beidou system exclusively achieves short message function and communication integration through active positioning RDSS. The Beidou short message SMS service is divided into SMS services provided to users in the Asia… Continue reading Comprehensive understanding of Beidou short message communication