IFAC verified correct end-to-end, receiver not decoding LoRa frame

Python verification of actual captured beacon packet confirms IFAC
is correct: unmask → verify signature → MATCH. The firmware crypto
implementation (IfacAuth.h) produces identical output to Reticulum.

T-Beam Supreme receiver detects RF energy (-74 dBm) but doesn't
decode a valid LoRa packet — the airtime counter shows activity but
no traffic is counted. Likely cause: near-field RF saturation (watch
and T-Beam are cm apart on the same Pi USB hub). The SX1262 receiver
may be overloaded at this close range.

Also: added beacon packet dump command 'B', extended crypto test
with live key verification, added T-Beam Supreme to device_init
signature bypass for development.

Device.h

@@ -264,8 +264,8 @@ bool device_init() {
     nRFCrypto.end();
     #endif
     device_init_done = true;
-    #if BOARD_MODEL == BOARD_TWATCH_ULT
-      // T-Watch development: skip firmware/device signature validation
+    #if BOARD_MODEL == BOARD_TWATCH_ULT || BOARD_MODEL == BOARD_TBEAM_S_V1
+      // Development: skip firmware/device signature validation
       fw_signature_validated = true;
       dev_signature_validated = true;
     #endif

Gui.h

@@ -800,6 +800,7 @@ bool gui_init() {
 //   'L' (0x4C) — Log toggle: start/stop IMU logging to SD card
 //   'F' (0x46) — File list: lists files on SD card
 //   'P' (0x50) — Profile: runs standardized performance test, reports JSON results
+//   'B' (0x42) — Beacon dump: dumps last beacon packet pre/post IFAC
 //   'C' (0x43) — Crypto test: runs IFAC test vectors, reports pass/fail
 
 #define GUI_CMD_PREFIX_LEN 3
@@ -1026,6 +1027,29 @@ static void gui_cmd_execute() {
             break;
         }
 
+        case 'B': {  // Beacon packet dump
+            extern uint8_t diag_beacon_pre[];
+            extern uint16_t diag_beacon_pre_len;
+            extern uint8_t diag_beacon_post[];
+            extern uint16_t diag_beacon_post_len;
+
+            Serial.write(hdr, 4);
+            Serial.printf("{\"pre_len\":%d,\"post_len\":%d", diag_beacon_pre_len, diag_beacon_post_len);
+            if (diag_beacon_pre_len > 0) {
+                Serial.printf(",\"pre\":\"");
+                for (int i = 0; i < diag_beacon_pre_len; i++) Serial.printf("%02x", diag_beacon_pre[i]);
+                Serial.printf("\"");
+            }
+            if (diag_beacon_post_len > 0) {
+                Serial.printf(",\"post\":\"");
+                for (int i = 0; i < diag_beacon_post_len; i++) Serial.printf("%02x", diag_beacon_post[i]);
+                Serial.printf("\"");
+            }
+            Serial.println("}");
+            Serial.flush();
+            break;
+        }
+
         case 'C': {  // Crypto test — IFAC test vectors
             #if HAS_GPS == true
             Serial.write(hdr, 4);
@@ -1072,11 +1096,16 @@ static void gui_cmd_execute() {
             ifac_configured = saved_configured;
 
             // Report
-            Serial.printf("{\"pk\":%s,\"sig\":%s,\"hkdf\":%s,\"ifac\":%s",
+            // Dump the live IFAC key for verification
+            Serial.printf("{\"pk\":%s,\"sig\":%s,\"hkdf\":%s,\"ifac\":%s,\"configured\":%s",
                 pk_match ? "true" : "false",
                 sig_match ? "true" : "false",
                 mask_match ? "true" : "false",
-                result_match ? "true" : "false");
+                result_match ? "true" : "false",
+                ifac_configured ? "true" : "false");
+            Serial.printf(",\"live_key\":\"");
+            for (int i = 0; i < 64; i++) Serial.printf("%02x", ifac_key[i]);
+            Serial.printf("\"");
 
             // Dump actual values on failure for debugging
             if (!sig_match) {

RNode_Firmware.ino

@@ -933,11 +933,30 @@ void transmit(uint16_t size) {
 // Transmit raw RNS packet without the 1-byte RNode LoRa header.
 // Used by beacon mode so the receiving RNode passes the packet
 // directly to Reticulum without a spurious header byte.
+// Diagnostic: dump last beacon packet (pre and post IFAC)
+uint8_t  diag_beacon_pre[256];
+uint16_t diag_beacon_pre_len = 0;
+uint8_t  diag_beacon_post[256];
+uint16_t diag_beacon_post_len = 0;
+
 void beacon_transmit(uint16_t size) {
   if (radio_online) {
+    // Save pre-IFAC packet for diagnostics
+    if (size <= 256) {
+      memcpy(diag_beacon_pre, tbuf, size);
+      diag_beacon_pre_len = size;
+    }
+
     #if HAS_GPS == true
       size = ifac_apply(tbuf, size);
     #endif
+
+    // Save post-IFAC packet
+    if (size <= 256) {
+      memcpy(diag_beacon_post, tbuf, size);
+      diag_beacon_post_len = size;
+    }
+
     LoRa->beginPacket();
     for (uint16_t i = 0; i < size; i++) {
       LoRa->write(tbuf[i]);
@@ -2032,7 +2051,8 @@ void loop() {
     } else {
 
       led_indicate_not_ready();
-      if (radio_online) stopRadio();  // only stop once
+      // Don't call stopRadio() — it calls SPI.end() which kills the bus.
+      // rnsd can still configure the radio via KISS even without hw_ready.
     }
   }