[feature]: USeparate application and debug output streams.

- Change DEBUG_RP2040_PORT to Serial in the dev environment to route debug output to USB CDC, which is not thread-safe.
- Application output remains on Serial1, strictly managed by async context on core 1 for thread safety.
- Update main.cpp to initialize Serial (USB CDC) without baud rate and add a short timeout for a robust startup.
- Ensures clear separation between thread-safe application output and non-thread-safe debug output.

Signed-off-by: Goran Mišković <[email protected]>

Author: schkovich

platformio.ini

@@ -29,7 +29,7 @@ platform_packages =
     framework-arduinopico@symlink://../arduino-pico
 build_flags =
     -DESPHOSTSPI=SPI
-    -DDEBUG_RP2040_PORT=Serial1
+    -DDEBUG_RP2040_PORT=Serial
     -DDEBUG_RP2040_CORE
     -DDEBUG_RP2040_WIRE
     -Og

src/main.cpp

@@ -210,6 +210,12 @@ void print_board_temperature() {
  * @brief Initializes the Wi-Fi connection and asynchronous context on Core 0.
  */
 void setup() {
+    Serial.begin(); // baud rate is ignored for USB CDC
+    // Wait up to 1 second for Serial to become ready, but do not block indefinitely
+    for (int i = 0; i < 100; ++i) {
+        if (Serial) break;
+        delay(10);
+    }
 
     Serial1.begin(115200);
     while (!Serial1) {