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H7: transceiver should be reset when switching the OBD multiplex #2256

@jyoung8607

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@jyoung8607

Honda CAN-FD cars only actually use CAN-FD on bus 1. Bus 0/2 and the OBD bus use standard CAN.

On initial entry into ELM327, we see CAN-FD traffic on bus 1.

When the mux changes to start VIN/UDS queries, we can't talk to anything because we're stuck in CAN-FD mode.

We get results from Panda query_fw_versions just fine on this exact same setup, which uses ELM327 in OBD mode from the start. We also get results from an old C2 I put up just to see if it fetched firmware.

Route: f39cf149898833ff/00000047--80bdd4f450

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