began work on the central routing logic, updated some documentation

protocol.md

@@ -0,0 +1,31 @@
+# The Specifications for ROSE
+Extensions to the protocol may change the specifications, see the
+devlogs for specific decisions on changes.
+
+## Packet specifications
+### Header
+
+#### (1 byte) Command + packet size
+- Packet sizes are chosen out of 4 predetermined sizes.  Using only 2
+  bits in this byte to be represented.
+- Commands are 6 bits with 64 possibilities, see the **Commands**
+  section for details.
+
+#### (1 byte) Destination address
+- This can refer to any end-device or fabric within the network
+
+#### (1 byte) Source address
+- This can refer to any end-device or fabric within the network
+
+### Payload
+Via commands, leading or trailing bytes in the payload can also be
+repurposed to timestamps or other feature extensions.
+
+### (1 byte) CRC-8
+To ensure delivery.
+
+## Commands
+TBD.
+### Feature Extensions
+#### [CMD: TBD] Include timestamp
+#### [CMD: TBD] Include sequence number