Differences

This shows you the differences between two versions of the page.

--- mosh:protocol:layers:transport:framing [2026/05/10 16:41] – [Version (Upper Nibble)] mosh
+++ mosh:protocol:layers:transport:framing [2026/05/15 04:27] (current) – [Domains, Operations Codes, and Context ID] mosh
@@ Line 25: / Line 25: @@
 All MOSH packets follow this structure:
-| Header (12 Bytes) |
+| Header (13 Bytes) |
 | Payload (1,456 Bytes max) |
 | Footer (CRC16) (2 Bytes) |
+Note: All multi-byte fields are serialized little-endian.
 ===== Header Layout (12 Bytes) =====
@@ Line 39: / Line 40: @@
 | Destination Address  | 2   | 6-bit Network ID + 10-bit Node ID |
 | Context              | 2   | 3-bit Domain, 5-bit Operations Code, 8-bit Context ID |
-| Payload Length       | 1   | Length of payload in bytes |
+| Payload Length       | 2   | Length of payload in bytes |
 ===== Footer (2 Bytes) =====
@@ Line 50: / Line 51: @@
 ===== Version and Flags =====
-==== Version (Upper 3-bits) ====
+==== Version (Upper nibble) ====
-Protocol version (0–7).
+Protocol version (0–15).
 ==== Flags (Lower Nibble) ====
 ^ Bit ^ Name          ^ Description ^
-| 0   | ACK_REQUIRED  | Sender requests acknowledgment |
+| 0x00 | NONE          | No flags are set               |
-| 1   | ACK           | Frame is an acknowledgment     |
+| 0x01 | ACK_REQUIRED  | Sender requests acknowledgment |
-| 2   | IS_RETRY      | Frame is a retransmission      |
+| 0x02 | ACK           | Frame is an acknowledgment     |
-| 3   | IS_FRAGMENT   | Frame is part of a fragment    |
+| 0x04 | IS_RETRY      | Frame is a retransmission      |
+| 0x08 | IS_FRAGMENT   | Frame is part of a fragment    |
 -----
@@ Line 83: / Line 85: @@
 The Context byte determines which manager processes the payload.
+===Domain (3-bits)===
 ^ Domain ^ Context  ^ Description ^
-| 0     | [[mosh:protocol:op_codes:system_op_codes|Core]]   | Core/system messages (discovery, sync, error) |
+| 0x00  | Core/system messages (discovery, sync, error) |
-| 1     | [[mosh:protocol:op_codes:node_op_codes|Node]]       | Node-level (hardware) operations |
+| 0x01  | Node-level (hardware) operations              |
-| 2     | [[mosh:protocol:op_codes:element_op_codes|Element]] | Element-level operations |
+| 0x02  | Element-level operations                      |
-| 3     | [[mosh:protocol:op_codes:vwire_op_codes|VWire]]     | Virtual wire messaging |
+| 0x03  | Virtual wire messaging                        |
-| 4–7   | RESERVED | Future expansion |
+| 0x04  | Transport-level operations                    |
+| 0x05  | Routing messages                              |
+| 0x06  | RESERVED1                                     |
+| 0x07  | RESERVED2                                     |
+===Operations Code (5-bits)===
+Each domain has it's own operations code definitions.
+  * [[mosh:protocol:op_codes:system_op_codes|Core]]
+  * [[mosh:protocol:op_codes:node_op_codes|Node]]
+  * [[mosh:protocol:op_codes:element_op_codes|Element]]
+  * [[mosh:protocol:op_codes:vwire_op_codes|VWire]]
+  * [[mosh:protocol:op_codes:transport_op_codes|Transport]]
+  * [[mosh:protocol:op_codes:routing_op_codes|Routing]]
+===Context ID (8-bits)===
 The Context ID byte is the ID of the element or virtual wire being targeted.