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Allow for two custom frames. #122

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Allow for two custom frames. #122

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6 changes: 6 additions & 0 deletions protocol-specification.md
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,12 @@ TLM | `0010` | `0x20`
RESERVED | `0011` | `0x30`
RESERVED | `0100` | `0x40`

The specification allows for two custom frames that are not described in the spec and are provider specific. Because they don't have a formal specification they should always be paired with either a UID or URL frame so the receiver can identify the provider.

Frame Type | High-Order 4 bits | Byte Value
:----------|:-----------------:|:---------:
CUSTOM | `1110` | `0xE0`
CUSTOM | `1111` | `0xF0`

The four low-order bits are reserved for future use and must be `0000`.

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