1. Cloud Hello

Publish the number of seconds since the ESP32 started to PxServ every ten seconds. With no external circuit, this project isolates Wi-Fi, API-key, and setData() setup.

Level: Beginner · Time: 15 minutes

What you will learn

• Create a PxServ client and connect an ESP32 to Wi-Fi
• Convert a numeric value to String
• Check a request through PxServ::Callback

Parts

• ESP32 DevKit V1
• Data-capable USB cable
• PxServ Arduino library 1.3.0+

No external wiring is required.

PxServ key

Complete sketch

#include <PxServ.h>
 
const char* WIFI_SSID = "your_wifi_ssid";
const char* WIFI_PASSWORD = "your_wifi_password";
const char* PXSERV_API_KEY = "your_pxserv_api_key";
 
PxServ client(PXSERV_API_KEY);
 
void setup() {
  Serial.begin(115200);
  PxServ::connectWifi(WIFI_SSID, WIFI_PASSWORD);
}
 
void loop() {
  unsigned long uptimeSeconds = millis() / 1000;
 
  PxServ::Callback result = client.setData(
    "cloud-hello/uptime",
    String(uptimeSeconds)
  );
 
  Serial.print("Status: ");
  Serial.print(result.status);
  Serial.print(" | Message: ");
  Serial.println(result.message);
  delay(10000);
}

Test

1. Replace the three connection values and upload the sketch.
2. Open Serial Monitor at 115200 baud.
3. Confirm successful requests return status 200.
4. Verify cloud-hello/uptime increases in the PxServ panel.

If connection messages never finish, confirm the credentials and use a 2.4 GHz Wi-Fi network. A non-200 response usually indicates an incorrect project API key.