Added the webserver and the wifi handling

src/main.cpp

@@ -0,0 +1,55 @@
+#include "bme280.h"
+#include "dhcp_server.h"
+#include "hardware/i2c.h"
+#include "lwip/apps/httpd.h"
+#include "pico/cyw43_arch.h"
+#include "pico/stdlib.h"
+#include "webserver.h"
+#include <cstdio>
+#include <cstring>
+
+void ap_init() {
+  cyw43_arch_enable_ap_mode("SensorAP", "passwort123", CYW43_AUTH_WPA2_AES_PSK);
+
+  ip_addr_t gw{};
+  ip_addr_t mask{};
+  IP4_ADDR(&gw, 192, 168, 4, 1);
+  IP4_ADDR(&mask, 255, 255, 255, 0);
+
+  static dhcp_server_t dhcp_server{};
+  dhcp_server_init(&dhcp_server, &gw, &mask);
+}
+
+int main() {
+
+  stdio_init_all();
+  sleep_ms(3000);
+  cyw43_arch_init();
+  httpd_init();
+  webserver_init();
+
+  while (true) {
+    memset(saved_ssid, 0, sizeof(saved_ssid));
+    memset(saved_password, 0, sizeof(saved_password));
+    ap_init();
+
+    while (saved_ssid[0] == '\0') {
+      cyw43_arch_poll();
+      sleep_ms(100);
+    }
+    cyw43_arch_disable_ap_mode();
+    cyw43_arch_enable_sta_mode();
+
+    if (!(cyw43_arch_wifi_connect_timeout_ms(saved_ssid, saved_password,
+                                             CYW43_AUTH_WPA2_AES_PSK, 20000))) {
+      break;
+    }
+  }
+
+  while (true) {
+    cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, 1);
+    sleep_ms(200);
+    cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, 0);
+    sleep_ms(200);
+  }
+}

src/webserver.c

@@ -0,0 +1,22 @@
+#include "lwip/apps/httpd.h"
+#include "string.h"
+
+char saved_ssid[33];
+char saved_password[65];
+
+static const char *config_handler(int iIndex, int iNumParams, char *pcParam[],
+                                  char *pcValue[]) {
+  for (int i = 0; i < iNumParams; i++) {
+    if (strcmp(pcParam[i], "ssid") == 0) {
+      strncpy(saved_ssid, pcValue[i], 32);
+    }
+    if (strcmp(pcParam[i], "password") == 0) {
+      strncpy(saved_password, pcValue[i], 64);
+    }
+  }
+  return "/index.html";
+}
+
+static const tCGI cgi_handlers[] = {{"/config", config_handler}};
+
+void webserver_init(void) { http_set_cgi_handlers(cgi_handlers, 1); }

src/webserver.h

@@ -0,0 +1,17 @@
+#ifndef WEBSERVER_H
+#define WEBSERVER_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern char saved_ssid[33];
+extern char saved_password[65];
+
+void webserver_init(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif