Added multiple main*.cpp files

platformio.ini

@@ -16,3 +16,7 @@ monitor_speed = 115200
 upload_port = /dev/cu.SLAB_USBtoUART
 debug_tool = esp-prog
 debug_init_break = tbreak setup
+; I am using src_filter as a cheap way to have multiple main files in one project.
+; To use it all you have to do is add the target main file like here we add main3.cpp as out build target:
+; src_filter =+<*> -<main*.cpp> +<main3.cpp>
+src_filter =+<*> -<main*.cpp> +<main3.cpp>

src/main2.cpp

@@ -0,0 +1,24 @@
+#include <Arduino.h>
+#include <foo.h>
+
+#define LED_BUILTIN 2
+int delayTime = 100;
+
+void setup()
+{
+  // put your setup code here, to run once:
+  pinMode(LED_BUILTIN, OUTPUT);
+  Serial.begin(115200);
+}
+
+void loop()
+{
+  // put your main code here, to run repeatedly:
+  Serial.println("Starting loop");
+  digitalWrite(LED_BUILTIN, HIGH);
+  delay(delayTime);
+  digitalWrite(LED_BUILTIN, LOW);
+  Serial.println("Turning off LED");
+  printf("This is main2.cpp!\n");
+  delay(delayTime);
+}

src/main3.cpp

@@ -0,0 +1,24 @@
+#include <Arduino.h>
+#include <foo.h>
+
+#define LED_BUILTIN 2
+int delayTime = 1000;
+
+void setup()
+{
+  // put your setup code here, to run once:
+  pinMode(LED_BUILTIN, OUTPUT);
+  Serial.begin(115200);
+}
+
+void loop()
+{
+  // put your main code here, to run repeatedly:
+  Serial.println("Starting loop");
+  digitalWrite(LED_BUILTIN, HIGH);
+  delay(delayTime);
+  digitalWrite(LED_BUILTIN, LOW);
+  Serial.println("Turning off LED");
+  printf("This is main3.cpp!\n");
+  delay(delayTime);
+}