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fix: Widen grp data type

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ref: #1928
This commit is contained in:
Janez T
2026-03-19 09:25:42 +01:00
parent 1fb26e7623
commit 2f68769185
9 changed files with 41 additions and 34 deletions
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14
docs/companion_protocol.md
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@@ -288,20 +288,20 @@ Bytes 7+: Message Text (UTF-8, variable length)
**Command Format**:
```
Byte 0: 0x3E
Byte 1: Data Type (`data_type`)
Byte 2: Channel Index (0-7)
Bytes 3+: Binary payload bytes (variable length)
Bytes 1-2: Data Type (`data_type`, 16-bit little-endian)
Byte 3: Channel Index (0-7)
Bytes 4+: Binary payload bytes (variable length)
```
**Data Type / Transport Mapping**:
- `0xFF` (`DATA_TYPE_CUSTOM`) must be used for custom-protocol binary datagrams.
- `0x00` is invalid for this command.
- Values other than `0xFF` are reserved for official protocol extensions.
- `0x0000` is invalid for this command.
- `0xFFFF` (`DATA_TYPE_CUSTOM`) is the generic custom-app namespace.
- Other non-zero values can be used as assigned application/community namespaces.
**Note**: Applications that need a timestamp should encode it inside the binary payload.
**Limits**:
- Maximum payload length is `166` bytes.
- Maximum payload length is `163` bytes.
- Larger payloads are rejected with `PACKET_ERROR`.
**Response**: `PACKET_OK` (0x00) on success