From 89308e30497c3d7f3c9d93a028eeff41d93dbc9a Mon Sep 17 00:00:00 2001
From: Stephen Waits <steve@waits.net>
Date: Sun, 29 Mar 2026 21:30:18 -0600
Subject: [PATCH] docs: fix PROTOCOL.md worked example bytes, add latency
 principle to DESIGN.md

---
 DESIGN.md        | 8 ++++++--
 docs/PROTOCOL.md | 2 +-
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/DESIGN.md b/DESIGN.md
index d5acd32f..574f4825 100644
--- a/DESIGN.md
+++ b/DESIGN.md
@@ -51,7 +51,11 @@ radio — it just gives you clean access to it.
     board, and even some uncommon ones. The architecture is designed to accommodate
     them cleanly. If the code isn't structured for a new board, fix the code.
 
-11. **Standard toolchain.** No custom Rust forks or special SDKs. Use stock `rustup`
+11. **Minimal overhead.** The dongle should add as little latency as possible
+    between the radio and the host. No unnecessary copies, no blocking operations
+    in the radio path, no computation that isn't strictly needed.
+
+12. **Standard toolchain.** No custom Rust forks or special SDKs. Use stock `rustup`
     channels (stable, nightly). Xtensa targets use nightly + `-Zbuild-std`; Cortex-M
     and RISC-V targets use stable. Boards that need the `esp` toolchain (via `espup`)
     are supported but gracefully skipped when the toolchain isn't installed.
@@ -60,7 +64,7 @@ radio — it just gives you clean access to it.
 
 ```
 Host PC
-  │ USB CDC-ACM (COBS-framed postcard)
+  │ USB CDC-ACM (COBS-framed fixed-size LE)
   ▼
 usb_task ──Command──► radio_task ──► SX1262
          ◄──Response──     │
diff --git a/docs/PROTOCOL.md b/docs/PROTOCOL.md
index cecc38c5..03cbf331 100644
--- a/docs/PROTOCOL.md
+++ b/docs/PROTOCOL.md
@@ -116,7 +116,7 @@ config = struct.pack("<IBBBHB",
 command = b"\x02" + config  # tag 2 = SetConfig
 ```
 
-Raw bytes: `02 00 93 87 36 07 07 05 24 14 80`
+Raw bytes: `02 C0 CA 89 36 07 07 05 24 14 80`
 
 ### 2. COBS-encode and send