Function knownCrcExtra

knownCrcExtra(msgid: number): number | null
Returns the CRC_EXTRA the common dialect publishes for a message id.
Parameters
- msgid: number
  The message id to look up.
Returns number | null
The seed, or null for an id outside the common dialect, which is what a Dialect is for.
- Defined in mavlink/src/index.ts:181