Primary-connected device control from vehicle computing platforms and secondary-connected devices

A non-transitory computer-readable medium, comprising instructions that, when executed by a processor of a mobile device, cause the mobile device to:

• advertise an application human-machine interface (HMI) service responsive to connection to a computing platform of a vehicle as the primary mobile device;
• connect to at least one secondary mobile device;
• and
• provide message flows via the HMI service of a connected application executed by the primary mobile device to the computing platform and to the at least one secondary mobile device, to cause the computing platform and the at least one secondary mobile device to render a user interface of the connected application.