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

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+//************************************************************
+// this is a simple example that uses the painlessMesh library to 
+// setup a node that logs to a central logging node
+// The logServer example shows how to configure the central logging nodes
+//************************************************************
+#include "painlessMesh.h"
+
+#define   MESH_PREFIX     "whateverYouLike"
+#define   MESH_PASSWORD   "somethingSneaky"
+#define   MESH_PORT       5555
+
+Scheduler     userScheduler; // to control your personal task
+painlessMesh  mesh;
+
+// Prototype
+void receivedCallback( uint32_t from, String &msg );
+
+size_t logServerId = 0;
+
+// Send message to the logServer every 10 seconds 
+Task myLoggingTask(10000, TASK_FOREVER, []() {
+#if ARDUINOJSON_VERSION_MAJOR==6
+        DynamicJsonDocument jsonBuffer(1024);
+        JsonObject msg = jsonBuffer.to<JsonObject>();
+#else
+        DynamicJsonBuffer jsonBuffer;
+        JsonObject& msg = jsonBuffer.createObject();
+#endif
+    msg["topic"] = "sensor";
+    msg["value"] = random(0, 180);
+
+    String str;
+#if ARDUINOJSON_VERSION_MAJOR==6
+    serializeJson(msg, str);
+#else
+    msg.printTo(str);
+#endif
+    if (logServerId == 0) // If we don't know the logServer yet
+        mesh.sendBroadcast(str);
+    else
+        mesh.sendSingle(logServerId, str);
+
+    // log to serial
+#if ARDUINOJSON_VERSION_MAJOR==6
+    serializeJson(msg, Serial);
+#else
+    msg.printTo(Serial);
+#endif
+    Serial.printf("\n");
+});
+
+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, &userScheduler, MESH_PORT, WIFI_AP_STA, 6 );
+  mesh.onReceive(&receivedCallback);
+
+  // Add the task to the your scheduler
+  userScheduler.addTask(myLoggingTask);
+  myLoggingTask.enable();
+}
+
+void loop() {
+  // it will run the user scheduler as well
+  mesh.update();
+}
+
+void receivedCallback( uint32_t from, String &msg ) {
+  Serial.printf("logClient: Received from %u msg=%s\n", from, msg.c_str());
+
+  // Saving logServer
+#if ARDUINOJSON_VERSION_MAJOR==6
+  DynamicJsonDocument jsonBuffer(1024 + msg.length());
+  DeserializationError error = deserializeJson(jsonBuffer, msg);
+  if (error) {
+    Serial.printf("DeserializationError\n");
+    return;
+  }
+  JsonObject root = jsonBuffer.as<JsonObject>();
+#else
+  DynamicJsonBuffer jsonBuffer;
+  JsonObject& root = jsonBuffer.parseObject(msg);
+#endif
+  if (root.containsKey("topic")) {
+      if (String("logServer").equals(root["topic"].as<String>())) {
+          // check for on: true or false
+          logServerId = root["nodeId"];
+          Serial.printf("logServer detected!!!\n");
+      }
+      Serial.printf("Handled from %u msg=%s\n", from, msg.c_str());
+  }
+}