Fix README and update manifests for C6 builds

.github/workflows/manual-build-artifacts.yml

@@ -4,9 +4,9 @@ on:
   workflow_dispatch:
     inputs:
       board_envs:
-        description: 'Comma-separated PlatformIO envs (e.g., "esp32s3,esp32c3").'
+        description: 'Comma-separated PlatformIO envs (e.g., "esp32s3,esp32c3,esp32c6,esp32c6m,seeed_esp32c6").'
         required: true
-        default: "esp32s3"
+        default: "esp32s3,seeed_esp32c3,esp32,seeed_esp32s3,esp32c3,esp32c3supermini,esp32c6,esp32c6m,seeed_esp32c6"
       git_ref:
         description: 'Git ref to build (tag, branch, or SHA).'
         required: true

README.md

@@ -114,6 +114,18 @@ This creates an isolated build environment in `tools/.venv/` and `tools/.platfor
 python tools/setup_local_env.py
 ```
 
+### Stress mode (optional)
+
+To accelerate loops and increase internal load for crash reproduction, build with:
+
+```ini
+# platformio.ini
+# Add to an environment's build_flags (preserving existing flags):
+build_flags =
+    ${common.build_flags}
+    -DSTRESS_MODE
+```
+
 ## Contributing
 
 - Run `python tools/build_and_flash.py --local` before opening a PR (verifies the build still succeeds).  

distributor/README.md

@@ -18,7 +18,7 @@ python -m http.server 8000
 Then open `http://localhost:8000`. Use `?tag=v0.6.1-alpha` (or omit to use the latest release).
 
 ## Expected release assets
-For each PlatformIO env (e.g., `esp32s3`, `esp32c3`, `esp32`, `seeed_esp32c3`, `seeed_esp32s3`, `esp32c3supermini`), the Release must include:
+For each PlatformIO env (e.g., `esp32s3`, `esp32c3`, `esp32`, `seeed_esp32c3`, `seeed_esp32s3`, `esp32c3supermini`, `esp32c6`, `esp32c6m`, `seeed_esp32c6`), the Release must include:
 - `<env>-firmware_merged.bin` (used for WebSerial flashing)
 - `<env>-firmware.bin` (OTA app)
 - `<env>-littlefs.bin` (OTA filesystem)

distributor/boards.json

@@ -101,6 +101,54 @@
       "files": [
         "firmware/seeed_esp32c3/firmware_merged.bin"
       ]
+    },
+    {
+      "id": "esp32c6",
+      "name": "OpenFilamentSensor",
+      "variant": "ESP32-C6",
+      "chipFamily": "ESP32-C6",
+      "status": "experimental",
+      "version": "0.5.0",
+      "released": "2026-03-01",
+      "manifest": "firmware/esp32c6/manifest.json",
+      "notes": [
+        "Experimental C6 build - untested"
+      ],
+      "files": [
+        "firmware/esp32c6/firmware_merged.bin"
+      ]
+    },
+    {
+      "id": "esp32c6m",
+      "name": "OpenFilamentSensor",
+      "variant": "ESP32-C6 DevKitM-1",
+      "chipFamily": "ESP32-C6",
+      "status": "experimental",
+      "version": "0.5.0",
+      "released": "2026-03-01",
+      "manifest": "firmware/esp32c6m/manifest.json",
+      "notes": [
+        "Experimental C6 DevKitM-1 build - untested"
+      ],
+      "files": [
+        "firmware/esp32c6m/firmware_merged.bin"
+      ]
+    },
+    {
+      "id": "seeed_esp32c6",
+      "name": "OpenFilamentSensor",
+      "variant": "Seeed XIAO ESP32-C6",
+      "chipFamily": "ESP32-C6",
+      "status": "experimental",
+      "version": "0.5.0",
+      "released": "2026-03-01",
+      "manifest": "firmware/seeed_esp32c6/manifest.json",
+      "notes": [
+        "Experimental Seeed XIAO ESP32-C6 build - untested"
+      ],
+      "files": [
+        "firmware/seeed_esp32c6/firmware_merged.bin"
+      ]
     }
   ]
 }

platformio.ini

@@ -29,16 +29,16 @@ lib_deps =
     adafruit/Adafruit GFX Library@^1.11.9
 build_flags =
     -D ELEGANTOTA_USE_ASYNC_WEBSERVER=1
-    ; -D FILAMENT_RUNOUT_PIN=12
-    ; -D MOVEMENT_SENSOR_PIN=13
+    -D FILAMENT_RUNOUT_PIN=12
+    -D MOVEMENT_SENSOR_PIN=13
     ; -D INVERT_RUNOUT_PIN=1  ; Uncomment in board config if pin logic is inverted
     ; Coredump configuration - saves crash info to flash partition for analysis
     ; -D CONFIG_APP_REPRODUCIBLE_BUILD=y  ; commented out because 
     ;   Firmware ThumbprintFilesystemThumbprint,Project Status
     ;   and Version displayed in the WebUI about tab might depend on them
--D CONFIG_ESP_COREDUMP_ENABLE_TO_FLASH=1
--D CONFIG_ESP_COREDUMP_DATA_FORMAT_ELF=1
--D CONFIG_ESP_COREDUMP_CHECKSUM_CRC32=1
+    -D CONFIG_ESP_COREDUMP_ENABLE_TO_FLASH=1
+    -D CONFIG_ESP_COREDUMP_DATA_FORMAT_ELF=1
+    -D CONFIG_ESP_COREDUMP_CHECKSUM_CRC32=1
 ; Crash testing endpoint (/api/panic) and UI section. Disable for release builds.
 ; -D ENABLE_CRASH_TESTING=1
 extra_scripts =
@@ -197,7 +197,7 @@ build_unflags =
 lib_deps =
     ${common.lib_deps}
 lib_ignore = 
-    WebServer ; arduino 3.x has its own synchrnous WebServer implementation that must be removed
+    WebServer ; arduino 3.x has its own synchronous WebServer implementation that must be removed
 extra_scripts =
 	${common.extra_scripts}
 	post:tools/merge_bin.py

src/ElegooCC.cpp

@@ -80,9 +80,9 @@ printer_info_t ElegooCC::getCurrentInformation()
     info.runoutPauseCommanded = runoutPauseCommanded;
     info.runoutPauseRemainingMm = runoutPauseRemainingMm;
     info.runoutPauseDelayMm   = runoutPauseDelayMm;
-    info.mainboardID          = mainboardID;
-    info.taskId               = taskId;
-    info.filename             = filename;
+    strlcpy(info.mainboardID, mainboardID.c_str(), sizeof(info.mainboardID));
+    strlcpy(info.taskId, taskId.c_str(), sizeof(info.taskId));
+    strlcpy(info.filename, filename.c_str(), sizeof(info.filename));
     info.printStatus          = printStatus;
     info.isPrinting           = (printStatus == SDCP_PRINT_STATUS_PRINTING && (machineStatusMask & (1 << SDCP_MACHINE_STATUS_PRINTING)) != 0);
     info.currentLayer         = currentLayer;

src/ElegooCC.h

@@ -78,12 +78,12 @@ typedef enum
     SDCP_COMMAND_STOP_FEEDING_MATERIAL = 132,
 } sdcp_command_t;
 
-// Struct to hold current printer information
+// Struct to hold current printer information (uses fixed-size buffers to avoid heap allocations)
 typedef struct
 {
-    String              mainboardID;
-    String              taskId;
-    String              filename;
+    char                mainboardID[64];
+    char                taskId[64];
+    char                filename[128];
     sdcp_print_status_t printStatus;
     bool                filamentStopped;
     bool                filamentRunout;

src/Logger.cpp

@@ -91,16 +91,17 @@ void Logger::logInternal(const char *message, LogLevel level)
         return;
     }
 
-    // Generate UUID
-    char uuid[37];
-    generateUUID(uuid);
-
-    // Get current timestamp
+    // Get current timestamp (safe to call outside critical section)
     unsigned long timestamp = getTime();
 
-    // Critical section for buffer update
+    // Critical section for buffer update - UUID generation is inside
+    // to prevent duplicate uuidCounter values from concurrent log() calls
     portENTER_CRITICAL(&_logMutex);
 
+    // Generate UUID inside critical section (uuidCounter++ must be atomic)
+    char uuid[37];
+    generateUUID(uuid);
+
     // Store in circular buffer with fixed-size copy
     strncpy(logBuffer[currentIndex].uuid, uuid, sizeof(logBuffer[currentIndex].uuid) - 1);
     logBuffer[currentIndex].uuid[sizeof(logBuffer[currentIndex].uuid) - 1] = '\0';
@@ -211,9 +212,11 @@ String Logger::getLogsAsText(int maxEntries)
         return result;
     }
 
-    // Snapshot indices atomically to avoid race conditions
+    // Snapshot indices atomically under mutex (same pattern as streamLogs)
+    portENTER_CRITICAL(&_logMutex);
     int snapshotIndex = currentIndex;
     int snapshotCount = totalEntries;
+    portEXIT_CRITICAL(&_logMutex);
 
     // Validate snapshot
     if (snapshotCount < 0 || snapshotCount > logCapacity)
@@ -344,14 +347,15 @@ void Logger::streamLogs(Print* printer)
 
 void Logger::clearLogs()
 {
-    currentIndex = 0;
-    totalEntries = 0;
     if (logCapacity == 0 || logBuffer == nullptr)
     {
         return;
     }
-    // Clear the buffer
+    // Clear the buffer - indices MUST be inside the critical section
+    // to avoid TOCTOU race with logInternal()
     portENTER_CRITICAL(&_logMutex);
+    currentIndex = 0;
+    totalEntries = 0;
     for (int i = 0; i < logCapacity; i++)
     {
         memset(logBuffer[i].uuid, 0, sizeof(logBuffer[i].uuid));