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arduino-cli/libraries/painlessMesh-master/examples/echoNode/echoNode.ino

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+//************************************************************
+// this is a simple example that uses the painlessMesh library and echos any
+// messages it receives
+//
+//************************************************************
+#include "painlessMesh.h"
+
+#define   MESH_PREFIX     "whateverYouLike"
+#define   MESH_PASSWORD   "somethingSneaky"
+#define   MESH_PORT       5555
+
+// Prototypes
+void receivedCallback( uint32_t from, String &msg );
+
+painlessMesh  mesh;
+
+void setup() {
+  Serial.begin(115200);
+    
+  mesh.setDebugMsgTypes( ERROR | STARTUP | CONNECTION );  // set before init() so that you can see startup messages
+
+  mesh.init( MESH_PREFIX, MESH_PASSWORD, MESH_PORT );
+  mesh.onReceive(&receivedCallback);
+}
+
+void loop() {
+  mesh.update();
+}
+
+void receivedCallback( uint32_t from, String &msg ) {
+  Serial.printf("echoNode: Received from %u msg=%s\n", from, msg.c_str());
+  mesh.sendSingle(from, msg);
+}

arduino-cli/libraries/painlessMesh-master/examples/echoNode/platformio.ini

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+[platformio]
+src_dir = .
+lib_extra_dirs = .piolibdeps/, ../../
+
+[env:nodemcuv2]
+platform = espressif8266
+board = nodemcuv2
+framework = arduino
+lib_deps = 
+    ArduinoJson
+#    painlessMesh