Create fullstackFirmware.ino

fullstackFirmware.ino

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+const unsigned int LED{17}; // define a constant for the LED pin
+
+const char S_OK { 0xaa };
+const char S_ERR { 0xff };
+
+void setup() {
+     pinMode(LED, OUTPUT);
+
+    // register "on_receive" as callback for RX event
+    USBSerial.onEvent(ARDUINO_HW_CDC_RX_EVENT, on_receive);
+    USBSerial.begin(9600);
+}
+
+void on_receive(void* event_handler_arg, esp_event_base_t event_base, int32_t event_id, void* event_data) {
+  // read one byte
+  char state { USBSerial.read() };
+  // guard byte is valid LED state
+  if (!(state == LOW || state == HIGH)) {
+    // invalid byte received
+    // what else should we do?
+    USBSerial.write(S_ERR);
+    return;
+  }
+  // update LED with valid state
+  digitalWrite(LED, state);
+  USBSerial.write(S_OK);
+}
+
+
+void loop() {
+  // put your main code here, to run repeatedly:
+
+}
+
+
+/*const unsigned int LED{17}; // define a constant for the LED pin
+
+void setup() {
+    pinMode(LED, OUTPUT); // configure the LED pin to be an output
+}
+
+void loop() {
+    digitalWrite(LED, HIGH); // turn the LED on
+    delay(1000); // wait 1 second
+    digitalWrite(LED, LOW); // turn the LED off
+    delay(1000); // wait 1 second
+}*/