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DMR CapMax Advantage Mode Can Produce 'No Frequency' Call Events #1834

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@DSheirer

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@DSheirer
  1. When decoding a DMR CapMax system operating in Advantage Mode, there can be call events that indicate NO FREQUENCY for a channel and other call events for that same channel that have a frequency. Update the message to ensure that the Tier III channels always receive their timeslot frequency enrichment so that the channel for the call event has a valid frequency.

  2. The DMR decoder state can produce an error while processing a Channel Grant when the messages is an UnknownCSBKMessage. This seems to happen if the decoded opcode is not a channel grant opcode and after the CRC is applied, the opcode becomes a channel grant opcode, however the message has already been constructed as an Unknown CSBK message. Update the logging to ignore when the CSBK class is unknown.

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