/**
 * ESP32-C6 Home Assistant Integration
 * Arduino IDE Project
 * 
 * Board: ESP32C6 Dev Module
 * Flash Size: 4MB
 * USB CDC On Boot: Enabled (REQUIRED for serial output!)
 * 
 * Provides REST API for Home Assistant integration
 */
// version 1.5 Initial release
#include <WiFi.h>
#include <WebServer.h>
#include <WiFiClient.h>

// WiFi credentials
const char* ssid = "BUON GUSTO PARTER";
const char* password = "arleta13";

// Web server on port 80
WebServer server(80);

// GPIO pins - Olimex ESP32-C6-EVB board configuration
const int LED_PIN = 8;          // Onboard LED
const int BUT_PIN = 9;          // Onboard button
const int RELAY_1_PIN = 10;     // Relay 1
const int RELAY_2_PIN = 11;     // Relay 2
const int RELAY_3_PIN = 22;     // Relay 3
const int RELAY_4_PIN = 23;     // Relay 4
const int DIN1_PIN = 1;         // Digital Input 1
const int DIN2_PIN = 2;         // Digital Input 2
const int DIN3_PIN = 3;         // Digital Input 3
const int DIN4_PIN = 15;        // Digital Input 4

// State tracking
bool relay1_state = false;
bool relay2_state = false;
bool relay3_state = false;
bool relay4_state = false;
bool led_state = false;

// Input state tracking - for change detection
bool input1_state = true;   // HIGH when not pressed (pull-up)
bool input2_state = true;
bool input3_state = true;
bool input4_state = true;
bool last_input1_state = true;
bool last_input2_state = true;
bool last_input3_state = true;
bool last_input4_state = true;
unsigned long last_input_check = 0;

// Home Assistant callback configuration
char ha_callback_url[256] = "";  // URL to POST input events to
bool ha_registered = false;

// Temperature simulation
float temperature = 25.0;

void setup() {
  // Initialize USB CDC serial
  Serial.begin(115200);
  delay(2000);  // Give time for USB CDC to initialize
  
  // Wait for serial port to be ready (up to 5 seconds)
  for (int i = 0; i < 10 && !Serial; i++) {
    delay(500);
  }
  
  Serial.println("\n\n=================================");
  Serial.println("ESP32-C6 Home Assistant Device");
  Serial.println("Arduino Framework");
  Serial.println("=================================");
  
  // Initialize GPIO - Outputs
  pinMode(LED_PIN, OUTPUT);
  pinMode(RELAY_1_PIN, OUTPUT);
  pinMode(RELAY_2_PIN, OUTPUT);
  pinMode(RELAY_3_PIN, OUTPUT);
  pinMode(RELAY_4_PIN, OUTPUT);
  // Initialize GPIO - Inputs with pull-up
  pinMode(BUT_PIN, INPUT_PULLUP);
  pinMode(DIN1_PIN, INPUT_PULLUP);
  pinMode(DIN2_PIN, INPUT_PULLUP);
  pinMode(DIN3_PIN, INPUT_PULLUP);
  pinMode(DIN4_PIN, INPUT_PULLUP);
  // Set all outputs to LOW
  digitalWrite(LED_PIN, LOW);
  digitalWrite(RELAY_1_PIN, LOW);
  digitalWrite(RELAY_2_PIN, LOW);
  digitalWrite(RELAY_3_PIN, LOW);
  digitalWrite(RELAY_4_PIN, LOW);
  
  Serial.println("GPIO initialized");
  
  // Configure WiFi
  Serial.println("\n--- WiFi Configuration ---");
  WiFi.mode(WIFI_STA);
  WiFi.setAutoReconnect(true);
  
  // Set static IP (prevents DHCP IP changes)
  IPAddress staticIP(192, 168, 0, 181);
  IPAddress gateway(192, 168, 0, 1);
  IPAddress subnet(255, 255, 255, 0);
  WiFi.config(staticIP, gateway, subnet);
  
  // Connect to WiFi
  Serial.print("Connecting to WiFi: ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  
  int attempts = 0;
  while (WiFi.status() != WL_CONNECTED && attempts < 40) {  // 40 * 500ms = 20 seconds
    delay(500);
    Serial.print(".");
    attempts++;
  }
  
  Serial.println("");  // New line after dots
  
  // Check WiFi status
  int wifiStatus = WiFi.status();
  if (wifiStatus == WL_CONNECTED) {
    Serial.println("\n✓ WiFi connected!");
    Serial.print("IP address: ");
    Serial.println(WiFi.localIP());
    Serial.print("RSSI: ");
    Serial.print(WiFi.RSSI());
    Serial.println(" dBm");
    Serial.print("MAC: ");
    Serial.println(WiFi.macAddress());
  } else {
    Serial.println("\n✗ WiFi connection failed!");
    Serial.print("WiFi Status Code: ");
    Serial.println(wifiStatus);
    // Status codes: 0=IDLE, 1=NO_SSID, 2=SCAN_COMPLETE, 3=CONNECTED, 4=CONNECT_FAILED, 5=CONNECTION_LOST, 6=DISCONNECTED
    switch(wifiStatus) {
      case WL_NO_SSID_AVAIL:
        Serial.println("ERROR: SSID not found! Check network name.");
        break;
      case WL_CONNECT_FAILED:
        Serial.println("ERROR: Connection failed! Check password.");
        break;
      case WL_CONNECTION_LOST:
        Serial.println("ERROR: Connection lost.");
        break;
      case WL_DISCONNECTED:
        Serial.println("ERROR: Disconnected from network.");
        break;
      default:
        Serial.println("ERROR: Unknown WiFi error.");
    }
    Serial.println("Continuing anyway to allow API access...");
    
    // Scan and show available networks
    scanWiFiNetworks();
  }
  
  // Setup API endpoints
  server.on("/", handleRoot);
  server.on("/api/status", HTTP_GET, handleStatus);
  // Relay endpoints
  server.on("/relay/on", HTTP_POST, handleRelayOn);
  server.on("/relay/off", HTTP_POST, handleRelayOff);
  server.on("/relay/status", HTTP_GET, handleRelayStatus);
  // Input endpoints
  server.on("/input/status", HTTP_GET, handleInputStatus);
  // Home Assistant webhook registration
  server.on("/register", HTTP_POST, handleRegister);
  // LED endpoints
  server.on("/led/on", HTTP_POST, handleLEDOn);
  server.on("/led/off", HTTP_POST, handleLEDOff);
  server.onNotFound(handleNotFound);
  
  // Start server
  server.begin();
  Serial.println("\n✓ HTTP server started on port 80");
  Serial.println("\n=================================");
  Serial.println("Ready! Try these endpoints:");
  Serial.print("  http://");
  Serial.print(WiFi.localIP());
  Serial.println("/api/status");
  Serial.println("=================================\n");
}

void loop() {
  server.handleClient();
  
  // Simulate temperature reading
  temperature = 25.0 + (random(-20, 20) / 10.0);
  
  // Check for input state changes every 50ms
  if (millis() - last_input_check > 50) {
    last_input_check = millis();
    checkInputChanges();
  }
  
  delay(10);
}

// ============================================
// WiFi Debug Function
// ============================================

void scanWiFiNetworks() {
  Serial.println("\n--- Available WiFi Networks ---");
  int n = WiFi.scanNetworks();
  if (n == 0) {
    Serial.println("No networks found!");
  } else {
    Serial.print("Found ");
    Serial.print(n);
    Serial.println(" networks:");
    for (int i = 0; i < n; i++) {
      Serial.print(i + 1);
      Serial.print(". ");
      Serial.print(WiFi.SSID(i));
      Serial.print(" (");
      Serial.print(WiFi.RSSI(i));
      Serial.print(" dBm) ");
      Serial.println(WiFi.encryptionType(i) == WIFI_AUTH_OPEN ? "Open" : "Secured");
    }
  }
  Serial.println("-------------------------------\n");
}

// ============================================
// API Handlers
// ============================================

void handleRoot() {
  // Read all inputs first to get current state
  input1_state = digitalRead(DIN1_PIN);
  input2_state = digitalRead(DIN2_PIN);
  input3_state = digitalRead(DIN3_PIN);
  input4_state = digitalRead(DIN4_PIN);

  String html = "<html><head><title>ESP32-C6 Device</title>";
  html += "<meta name='viewport' content='width=device-width, initial-scale=1'>";
  html += "<style>";
  html += "body{font-family:Arial;margin:20px;background:#f0f0f0}";
  html += ".card{background:white;padding:20px;margin:10px 0;border-radius:8px;box-shadow:0 2px 4px rgba(0,0,0,0.1)}";
  html += "h1{color:#333}h2{color:#555;font-size:17px;margin-top:0;margin-bottom:12px}";
  html += ".grid2{display:grid;grid-template-columns:1fr 1fr;gap:10px}";
  // Input item with round LED indicator
  html += ".inp-item{display:flex;align-items:center;gap:12px;padding:10px 14px;background:#f7f7f7;border-radius:8px;border:1px solid #e0e0e0}";
  html += ".led{width:22px;height:22px;border-radius:50%;flex-shrink:0;transition:background 0.3s,box-shadow 0.3s}";
  html += ".led-on{background:#4CAF50;box-shadow:0 0 8px #4CAF5099}";
  html += ".led-off{background:#f44336;box-shadow:0 0 8px #f4433666}";
  html += ".inp-name{font-weight:bold;font-size:14px;color:#333}";
  html += ".inp-state{font-size:11px;color:#888;margin-top:2px}";
  // Relay toggle buttons
  html += ".relay-btn{width:100%;padding:14px 8px;border:none;border-radius:8px;cursor:pointer;font-size:14px;font-weight:bold;transition:background 0.2s,transform 0.1s}";
  html += ".relay-btn:active{transform:scale(0.97)}";
  html += ".relay-on{background:#4CAF50;color:white}";
  html += ".relay-off{background:#9e9e9e;color:white}";
  html += ".relay-on:hover{background:#43A047}.relay-off:hover{background:#757575}";
  // LED control & webhook
  html += ".card-row{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:10px 0}";  // two big columns
  html += ".card-row .card{margin:0}";                                                           // reset per-card margin inside row
  html += ".btn{padding:8px 16px;margin:4px;border:none;border-radius:4px;cursor:pointer;font-size:14px}";
  html += ".btn-on{background:#4CAF50;color:white}.btn-off{background:#f44336;color:white}";
  html += ".wh-ok{background:#c8e6c9;color:#1b5e20;padding:10px;border-radius:4px}";
  html += ".wh-err{background:#ffcdd2;color:#b71c1c;padding:10px;border-radius:4px}";
  html += "</style>";
  html += "<script>";
  // Relay toggle: read current state from data-state attribute, POST, update DOM
  html += "function toggleRelay(n){";
  html += "var b=document.getElementById('r'+n);";
  html += "var on=b.dataset.state==='1';";
  html += "fetch((on?'/relay/off':'/relay/on')+'?relay='+n,{method:'POST'})";
  html += ".then(function(){var ns=!on;b.dataset.state=ns?'1':'0';";
  html += "b.className='relay-btn '+(ns?'relay-on':'relay-off');";
  html += "b.textContent='Relay '+n+': '+(ns?'ON':'OFF');})";
  html += ".catch(function(e){console.error(e);});";
  html += "}";
  // Polling: update LED indicators and relay button states
  html += "function updateStatus(){fetch('/api/status').then(function(r){return r.json();}).then(function(d){";
  html += "for(var i=1;i<=4;i++){";
  // input: raw HIGH=not pressed, so pressed = !d['input'+i]
  html += "var p=!d['input'+i];";
  html += "document.getElementById('led'+i).className='led '+(p?'led-on':'led-off');";
  html += "document.getElementById('is'+i).textContent=p?'PRESSED':'NOT PRESSED';";
  // relay: update toggle button
  html += "var b=document.getElementById('r'+i);var on=d['relay'+i];";
  html += "b.dataset.state=on?'1':'0';";
  html += "b.className='relay-btn '+(on?'relay-on':'relay-off');";
  html += "b.textContent='Relay '+i+': '+(on?'ON':'OFF');";
  html += "}";
  html += "}).catch(function(e){console.error(e);});}";
  html += "window.addEventListener('load',function(){updateStatus();setInterval(updateStatus,2000);});";
  html += "</script>";
  html += "</head><body>";
  html += "<h1>ESP32-C6 Control Panel</h1>";

  // Device Info
  html += "<div class='card'><h2>Device Info</h2>";
  html += "IP: " + WiFi.localIP().toString() + " &nbsp; ";
  html += "RSSI: " + String(WiFi.RSSI()) + " dBm &nbsp; ";
  html += "Temp: " + String(temperature, 1) + "°C &nbsp; ";
  html += "Uptime: " + String(millis() / 1000) + "s</div>";

  // Inputs + Relays side by side in a 2-column row
  html += "<div class='card-row'>";

  // Inputs — 2-column inner grid, round LED indicator
  html += "<div class='card'><h2>Inputs</h2><div class='grid2'>";
  bool inputStates[5] = {false, input1_state, input2_state, input3_state, input4_state};
  for (int i = 1; i <= 4; i++) {
    bool pressed = !inputStates[i];  // pull-up: LOW=pressed
    html += "<div class='inp-item'>";
    html += "<div class='led " + String(pressed ? "led-on" : "led-off") + "' id='led" + String(i) + "'></div>";
    html += "<div><div class='inp-name'>Input " + String(i) + "</div>";
    html += "<div class='inp-state' id='is" + String(i) + "'>" + String(pressed ? "PRESSED" : "NOT PRESSED") + "</div></div>";
    html += "</div>";
  }
  html += "</div></div>"; // close Inputs card

  // Relays — 2-column inner grid, toggle buttons
  html += "<div class='card'><h2>Relays</h2><div class='grid2'>";
  bool relayStates[5] = {false, relay1_state, relay2_state, relay3_state, relay4_state};
  for (int i = 1; i <= 4; i++) {
    bool on = relayStates[i];
    html += "<button class='relay-btn " + String(on ? "relay-on" : "relay-off") + "' ";
    html += "id='r" + String(i) + "' data-state='" + String(on ? "1" : "0") + "' ";
    html += "onclick='toggleRelay(" + String(i) + ")'>";
    html += "Relay " + String(i) + ": " + String(on ? "ON" : "OFF");
    html += "</button>";
  }
  html += "</div></div>"; // close Relays card
  html += "</div>"; // close .card-row

  // LED Control
  html += "<div class='card'><h2>LED Control</h2>";
  html += "<button class='btn btn-on' onclick='fetch(\"/led/on\",{method:\"POST\"}).then(()=>location.reload())'>LED ON</button>";
  html += "<button class='btn btn-off' onclick='fetch(\"/led/off\",{method:\"POST\"}).then(()=>location.reload())'>LED OFF</button>";
  html += " &nbsp; Status: <strong>" + String(led_state ? "ON" : "OFF") + "</strong></div>";

  // Home Assistant Webhook Status
  html += "<div class='card'><h2>Home Assistant Webhook</h2>";
  if (ha_registered && strlen(ha_callback_url) > 0) {
    html += "<div class='wh-ok'>&#10003; Connected &mdash; " + String(ha_callback_url) + "</div>";
  } else {
    html += "<div class='wh-err'>&#10007; Not registered &mdash; waiting for Home Assistant...</div>";
  }
  html += "</div>";

  html += "<div class='card'><h2>API Endpoints</h2>";
  html += "GET /api/status &nbsp; POST /relay/on?relay=1-4 &nbsp; POST /relay/off?relay=1-4<br>";
  html += "GET /input/status?input=1-4 &nbsp; POST /led/on &nbsp; POST /led/off<br>";
  html += "POST /register?callback_url=...</div>";

  html += "</body></html>";

  server.send(200, "text/html", html);
}

// Status request monitoring
static unsigned long last_status_log = 0;
static int status_request_count = 0;

void handleStatus() {
  status_request_count++;
  
  // Read fresh input states
  input1_state = digitalRead(DIN1_PIN);
  input2_state = digitalRead(DIN2_PIN);
  input3_state = digitalRead(DIN3_PIN);
  input4_state = digitalRead(DIN4_PIN);
  
  String json = "{";
  json += "\"input1\":" + String(input1_state ? "true" : "false") + ",";
  json += "\"input2\":" + String(input2_state ? "true" : "false") + ",";
  json += "\"input3\":" + String(input3_state ? "true" : "false") + ",";
  json += "\"input4\":" + String(input4_state ? "true" : "false") + ",";
  json += "\"relay1\":" + String(relay1_state ? "true" : "false") + ",";
  json += "\"relay2\":" + String(relay2_state ? "true" : "false") + ",";
  json += "\"relay3\":" + String(relay3_state ? "true" : "false") + ",";
  json += "\"relay4\":" + String(relay4_state ? "true" : "false") + ",";
  json += "\"led\":" + String(led_state ? "true" : "false");
  json += "}";
  
  server.send(200, "application/json", json);
  
  // Log status every 10 seconds
  if (millis() - last_status_log > 10000) {
    last_status_log = millis();
    Serial.printf("API: %d requests/10sec, Free heap: %d bytes, Uptime: %lus\n", status_request_count, ESP.getFreeHeap(), millis() / 1000);
    status_request_count = 0;
  }
}

void handleRelayOn() {
  if (!server.hasArg("relay")) {
    server.send(400, "application/json", "{\"error\":\"Missing relay parameter\"}");
    return;
  }
  
  int relay_num = server.arg("relay").toInt();
  int pin = -1;
  bool *state_ptr = nullptr;
  
  switch(relay_num) {
    case 1: pin = RELAY_1_PIN; state_ptr = &relay1_state; break;
    case 2: pin = RELAY_2_PIN; state_ptr = &relay2_state; break;
    case 3: pin = RELAY_3_PIN; state_ptr = &relay3_state; break;
    case 4: pin = RELAY_4_PIN; state_ptr = &relay4_state; break;
    default:
      server.send(400, "application/json", "{\"error\":\"Invalid relay number\"}");
      return;
  }
  
  digitalWrite(pin, HIGH);
  *state_ptr = true;
  server.send(200, "application/json", "{\"status\":\"ok\",\"state\":true}");
  Serial.printf("Relay %d ON\n", relay_num);
}

void handleRelayOff() {
  if (!server.hasArg("relay")) {
    server.send(400, "application/json", "{\"error\":\"Missing relay parameter\"}");
    return;
  }
  
  int relay_num = server.arg("relay").toInt();
  int pin = -1;
  bool *state_ptr = nullptr;
  
  switch(relay_num) {
    case 1: pin = RELAY_1_PIN; state_ptr = &relay1_state; break;
    case 2: pin = RELAY_2_PIN; state_ptr = &relay2_state; break;
    case 3: pin = RELAY_3_PIN; state_ptr = &relay3_state; break;
    case 4: pin = RELAY_4_PIN; state_ptr = &relay4_state; break;
    default:
      server.send(400, "application/json", "{\"error\":\"Invalid relay number\"}");
      return;
  }
  
  digitalWrite(pin, LOW);
  *state_ptr = false;
  server.send(200, "application/json", "{\"status\":\"ok\",\"state\":false}");
  Serial.printf("Relay %d OFF\n", relay_num);
}

void handleRelayStatus() {
  if (!server.hasArg("relay")) {
    server.send(400, "application/json", "{\"error\":\"Missing relay parameter\"}");
    return;
  }
  
  int relay_num = server.arg("relay").toInt();
  bool state = false;
  
  switch(relay_num) {
    case 1: state = relay1_state; break;
    case 2: state = relay2_state; break;
    case 3: state = relay3_state; break;
    case 4: state = relay4_state; break;
    default:
      server.send(400, "application/json", "{\"error\":\"Invalid relay number\"}");
      return;
  }
  
  String json = "{\"state\":" + String(state ? "true" : "false") + "}";
  server.send(200, "application/json", json);
}

void handleInputStatus() {
  if (!server.hasArg("input")) {
    server.send(400, "application/json", "{\"error\":\"Missing input parameter\"}");
    return;
  }
  
  int input_num = server.arg("input").toInt();
  int pin = -1;
  
  switch(input_num) {
    case 1: pin = DIN1_PIN; break;
    case 2: pin = DIN2_PIN; break;
    case 3: pin = DIN3_PIN; break;
    case 4: pin = DIN4_PIN; break;
    default:
      server.send(400, "application/json", "{\"error\":\"Invalid input number\"}");
      return;
  }
  
  int level = digitalRead(pin);
  String json = "{\"state\":" + String(level ? "true" : "false") + "}";
  server.send(200, "application/json", json);
  Serial.printf("Input %d status: %d\n", input_num, level);
}

void handleLEDOn() {
  digitalWrite(LED_PIN, LOW);  // LED is active-low
  led_state = true;
  server.send(200, "application/json", "{\"status\":\"ok\"}");
  Serial.println("LED ON");
}

void handleLEDOff() {
  digitalWrite(LED_PIN, HIGH);  // LED is active-low
  led_state = false;
  server.send(200, "application/json", "{\"status\":\"ok\"}");
  Serial.println("LED OFF");
}

void handleNotFound() {
  String message = "404: Not Found\n\n";
  message += "URI: " + server.uri() + "\n";
  message += "Method: " + String((server.method() == HTTP_GET) ? "GET" : "POST") + "\n";
  server.send(404, "text/plain", message);
}

// ============================================
// Home Assistant Integration
// ============================================

void handleRegister() {
  if (!server.hasArg("callback_url")) {
    server.send(400, "application/json", "{\"error\":\"Missing callback_url parameter\"}");
    return;
  }
  
  String url = server.arg("callback_url");
  if (url.length() > 255) {
    server.send(400, "application/json", "{\"error\":\"URL too long (max 255 chars)\"}");
    return;
  }
  
  url.toCharArray(ha_callback_url, 256);
  ha_registered = true;
  
  Serial.printf("Home Assistant webhook registered: %s\n", ha_callback_url);
  server.send(200, "application/json", "{\"status\":\"ok\",\"message\":\"Webhook registered\"}");
}

void checkInputChanges() {
  if (!ha_registered) return;  // Only check if HA is registered
  
  // Read all input states
  bool curr_input1 = digitalRead(DIN1_PIN);
  bool curr_input2 = digitalRead(DIN2_PIN);
  bool curr_input3 = digitalRead(DIN3_PIN);
  bool curr_input4 = digitalRead(DIN4_PIN);
  
  // Check for changes and POST events
  if (curr_input1 != last_input1_state) {
    last_input1_state = curr_input1;
    postInputEvent(1, curr_input1);
  }
  if (curr_input2 != last_input2_state) {
    last_input2_state = curr_input2;
    postInputEvent(2, curr_input2);
  }
  if (curr_input3 != last_input3_state) {
    last_input3_state = curr_input3;
    postInputEvent(3, curr_input3);
  }
  if (curr_input4 != last_input4_state) {
    last_input4_state = curr_input4;
    postInputEvent(4, curr_input4);
  }
}

void postInputEvent(int input_num, bool state) {
  if (!ha_registered || strlen(ha_callback_url) == 0) {
    return;  // Not registered, skip
  }
  
  // Invert state because inputs use pull-up (HIGH=not pressed, LOW=pressed)
  bool pressed = !state;
  String event_type = pressed ? "input_on" : "input_off";
  
  Serial.printf("Input %d event: %s (raw_state=%d) - POSTing to HA\n", input_num, event_type.c_str(), state);
  
  // Parse callback URL (format: http://host:port/path)
  String url_str = String(ha_callback_url);
  
  // Extract host and path
  int protocol_end = url_str.indexOf("://");
  if (protocol_end < 0) return;
  
  int host_start = protocol_end + 3;
  int port_separator = url_str.indexOf(":", host_start);
  int path_start = url_str.indexOf("/", host_start);
  
  if (path_start < 0) path_start = url_str.length();
  if (port_separator < 0 || port_separator > path_start) port_separator = -1;
  
  String host = url_str.substring(host_start, (port_separator >= 0) ? port_separator : path_start);
  int port = 80;  // Default HTTP port
  if (port_separator >= 0) {
    int colon_port_end = url_str.indexOf("/", port_separator);
    if (colon_port_end < 0) colon_port_end = url_str.length();
    String port_str = url_str.substring(port_separator + 1, colon_port_end);
    port = port_str.toInt();
  }
  String path = url_str.substring(path_start);
  
  // Create JSON payload
  String json = "{\"input\":" + String(input_num) + ",\"state\":" + (pressed ? "true" : "false") + "}";
  
  // Connect to Home Assistant and POST
  WiFiClient client;
  if (!client.connect(host.c_str(), port)) {
    Serial.printf("Failed to connect to %s:%d\n", host.c_str(), port);
    return;
  }
  
  // Send HTTP POST request
  client.println("POST " + path + " HTTP/1.1");
  client.println("Host: " + host);
  client.println("Content-Type: application/json");
  client.println("Content-Length: " + String(json.length()));
  client.println("Connection: close");
  client.println();
  client.print(json);
  
  // Wait for response
  delay(100);
  
  // Read response
  while (client.available()) {
    char c = client.read();
    // Just discard the response for now
  }
  
  client.stop();
  Serial.printf("Input %d event posted successfully\n", input_num);
}