esp32_client.ino

// SPDX-FileCopyrightText: 2020 Brent Rubell for Adafruit Industries
//
// SPDX-License-Identifier: MIT

/*
  Web client

 This sketch connects to a website (wifitest.adafruit.com/testwifi/index.html)
 using the WiFi module.

 This example is written for a network using WPA encryption. For
 WEP or WPA, change the Wifi.begin() call accordingly.

 This example is written for a network using WPA encryption. For
 WEP or WPA, change the Wifi.begin() call accordingly.

 created 13 July 2010
 by dlf (Metodo2 srl)
 modified 31 May 2012
 by Tom Igoe

 modified with sleep and wakeup signaling
 */

#include <WiFi.h>
#include <WiFiUdp.h>

// Enter your WiFi SSID and password
char ssid[] = "Zi-Net";   // your network SSID (name)
char pass[] = "password"; // your network password (use for WPA, or use as key for WEP)

unsigned int udpPort = 2399;
const char *udpAddress = "192.168.4.1";

int status = WL_IDLE_STATUS;

// Initialize the Ethernet client library
// with the IP address and port of the server
// that you want to connect to (port 80 is default for HTTP):
WiFiClient client;
WiFiUDP udp;
int incomingByte = 0; // for incoming serial data

void setup()
{
    // Initialize serial and wait for port to open:
    Serial.begin(115200);
    while (!Serial)
    {
        ; // wait for serial port to connect. Needed for native USB port only
    }
    //    pinMode(pushSwitch.pin, INPUT_PULLUP);

    pinMode(GPIO_NUM_32, INPUT);
    pinMode(GPIO_NUM_33, OUTPUT);
    // attempt to connect to Wifi network:
    Serial.print("Attempting to connect to SSID: ");
    Serial.println(ssid);

    WiFi.begin(ssid, pass);
    while (WiFi.status() != WL_CONNECTED)
    {
        delay(500);
        Serial.print(".");
    }

    Serial.println("");
    Serial.println("Connected to WiFi");
    printWifiStatus();
    digitalWrite(GPIO_NUM_33, HIGH);
    esp_sleep_enable_ext0_wakeup(GPIO_NUM_32, 0);
}

void loop()
{
    if (digitalRead(GPIO_NUM_32) == HIGH)
    {
        digitalWrite(GPIO_NUM_33, LOW);
        Serial.println("sleeping");
        esp_deep_sleep_start();
    }

    if (Serial.available() > 0)
    {
        // read the incoming byte:
        incomingByte = Serial.read();

        uint8_t buffer[1] = {char(incomingByte)};
        // This initializes udp and transfer buffer
        udp.beginPacket(udpAddress, udpPort);
        udp.write(buffer, 1);
        udp.endPacket();
    }
}

void printWifiStatus()
{
    // print the SSID of the network you're attached to:
    Serial.print("SSID: ");
    Serial.println(WiFi.SSID());

    // print your board's IP address:
    IPAddress ip = WiFi.localIP();
    Serial.print("IP Address: ");
    Serial.println(ip);

    // print the received signal strength:
    long rssi = WiFi.RSSI();
    Serial.print("signal strength (RSSI):");
    Serial.print(rssi);
    Serial.println(" dBm");
}