Sends command message 0x30 (SetRxChain) to the state machine.
Sends command message 0x30 (SetRxChain) to the state machine.
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The input value must be 1-3.
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The message handler calls two vfuncs. The first vfunc uses the input u32 directly to configure "rxchain". The second vfunc configures "btc_params" with data determined using the input value.