Case teaching

[ChangYanChu]

Could you provide an instance demo for this library? Also, may I ask how well this library works?

[medisoft]

It is still in development. I need to implement something to handle devices that have intermittent connectivity, like those battery powered, and also to distribute messages in wide areas, hoping from one node to another one.

[medisoft]

You need to do something like this:

void receivedCallbackJson(uint64_t from, JsonDocument jsonDoc) {
  String msg;
  serializeJson(jsonDoc, msg);
  Serial.printf("startHere: Received from %llX msg=%s\n", from, msg.c_str());
  String cmd = jsonDoc["cmd"];
  Serial.println("Comando: " + cmd);
  if (cmd.equals("OTA")) {
    jsonDoc["cmd"] = "ACK";
    espMeshNow.send(espMeshNow.getNodeId(), from, jsonDoc);
    nextBootOTA = 1;
    delay(10);
    Serial.println("Restarting to run OTA");
    ESP.restart();
  }
}

void setup() {
    espMeshNow.init(2);
    espMeshNow.onReceive(&receivedCallbackJson);
}

void loop() {
  battery_data_t batt = getBatteryLevels();
  scanner.Scan();

  Serial.printf("Batt: %.02fv %.01f%% Cargando: %s\n", batt.voltage,
                batt.remaining_percent,
                digitalRead(CHARGING_SENSOR) == HIGH ? "NO" : "SI");
  if (espMeshNow.isRunning()) {
    JsonDocument doc;
    doc["cmd"] = "PING";
    doc["sq"] = esp_random();
    espMeshNow.send(espMeshNow.getNodeId(), 0, doc);
    delay(50 + esp_random() % 100);

    doc["cmd"]                   = "BATT";
    doc["sq"]                    = esp_random() % 10000;
    JsonObject payload           = doc["payload"].to<JsonObject>();
    payload["remaining_percent"] = batt.remaining_percent;
    payload["raw"]               = batt.raw;
    payload["voltage"]           = batt.voltage;
    payload["charging"]          = digitalRead(CHARGING_SENSOR) == HIGH ? LOW : HIGH;
    espMeshNow.send(espMeshNow.getNodeId(), 0, doc);
    delay(1000 + esp_random() % 100);

    if (nextBootOTA == 1) {
      ESP_LOGI(TAG, "Reiniciando para actualizar");
      ESP.restart();
    } else {
      Serial.println("Durmiendo");
      if (espMeshNow.getNodeId() == 0x4022D8EDC1F0)
        esp_deep_sleep(600e6);
      esp_deep_sleep(SLEEP_TIME);
    }
  }
  while (true)
    delay(1000);
}

this brief example (you need to add more code, of course), initializes the meshnow with channel 2, and attach a callback that receives json messages, also in the message you can see how to send another message.

In the loop, you can see a PING, and a delay, needed if you are going to sleep soon after powering up.