feat(net): Add NAPT example for PPP

libraries/PPP/examples/PPP_WIFI_BRIDGE/PPP_WIFI_BRIDGE.ino

@@ -0,0 +1,168 @@
+#include <PPP.h>
+#include <WiFi.h>
+
+#define PPP_MODEM_APN "internet"
+#define PPP_MODEM_PIN "0000"  // or NULL
+
+// WaveShare SIM7600 HW Flow Control
+#define PPP_MODEM_RST       25
+#define PPP_MODEM_RST_LOW   false  //active HIGH
+#define PPP_MODEM_RST_DELAY 200
+#define PPP_MODEM_TX        21
+#define PPP_MODEM_RX        22
+#define PPP_MODEM_RTS       26
+#define PPP_MODEM_CTS       27
+#define PPP_MODEM_FC        ESP_MODEM_FLOW_CONTROL_HW
+#define PPP_MODEM_MODEL     PPP_MODEM_SIM7600
+
+// SIM800 basic module with just TX,RX and RST
+// #define PPP_MODEM_RST     0
+// #define PPP_MODEM_RST_LOW true //active LOW
+// #define PPP_MODEM_TX      2
+// #define PPP_MODEM_RX      19
+// #define PPP_MODEM_RTS     -1
+// #define PPP_MODEM_CTS     -1
+// #define PPP_MODEM_FC      ESP_MODEM_FLOW_CONTROL_NONE
+// #define PPP_MODEM_MODEL   PPP_MODEM_SIM800
+
+// WiFi Access Point Config
+#define AP_SSID "ESP32-ETH-WIFI-BRIDGE"
+#define AP_PASS "password"
+
+IPAddress ap_ip(192, 168, 4, 1);
+IPAddress ap_mask(255, 255, 255, 0);
+IPAddress ap_leaseStart(192, 168, 4, 2);
+IPAddress ap_dns(8, 8, 4, 4);
+
+void setup() {
+  Serial.begin(115200);
+  Serial.setDebugOutput(true);
+
+  // Listen for modem events
+  Network.onEvent(onEvent);
+
+  // Start the Access Point
+  WiFi.AP.begin();
+  WiFi.AP.config(ap_ip, ap_ip, ap_mask, ap_leaseStart, ap_dns);
+  WiFi.AP.create(AP_SSID, AP_PASS);
+  if(!WiFi.AP.waitStatusBits(ESP_NETIF_STARTED_BIT, 1000)){
+    Serial.println("Failed to start AP!");
+    return;
+  }
+
+  // Configure the modem
+  PPP.setApn(PPP_MODEM_APN);
+  PPP.setPin(PPP_MODEM_PIN);
+  PPP.setResetPin(PPP_MODEM_RST, PPP_MODEM_RST_LOW, PPP_MODEM_RST_DELAY);
+  PPP.setPins(PPP_MODEM_TX, PPP_MODEM_RX, PPP_MODEM_RTS, PPP_MODEM_CTS, PPP_MODEM_FC);
+
+  Serial.println("Starting the modem. It might take a while!");
+  PPP.begin(PPP_MODEM_MODEL);
+
+  Serial.print("Manufacturer: ");
+  Serial.println(PPP.cmd("AT+CGMI", 10000));
+  Serial.print("Model: ");
+  Serial.println(PPP.moduleName());
+  Serial.print("IMEI: ");
+  Serial.println(PPP.IMEI());
+
+  bool attached = PPP.attached();
+  if (!attached) {
+    int i = 0;
+    unsigned int s = millis();
+    Serial.print("Waiting to connect to network");
+    while (!attached && ((++i) < 600)) {
+      Serial.print(".");
+      delay(100);
+      attached = PPP.attached();
+    }
+    Serial.print((millis() - s) / 1000.0, 1);
+    Serial.println("s");
+    attached = PPP.attached();
+  }
+
+  Serial.print("Attached: ");
+  Serial.println(attached);
+  Serial.print("State: ");
+  Serial.println(PPP.radioState());
+  if (attached) {
+    Serial.print("Operator: ");
+    Serial.println(PPP.operatorName());
+    Serial.print("IMSI: ");
+    Serial.println(PPP.IMSI());
+    Serial.print("RSSI: ");
+    Serial.println(PPP.RSSI());
+    int ber = PPP.BER();
+    if (ber > 0) {
+      Serial.print("BER: ");
+      Serial.println(ber);
+      Serial.print("NetMode: ");
+      Serial.println(PPP.networkMode());
+    }
+
+    Serial.println("Switching to data mode...");
+    PPP.mode(ESP_MODEM_MODE_CMUX);  // Data and Command mixed mode
+    if (!PPP.waitStatusBits(ESP_NETIF_CONNECTED_BIT, 1000)) {
+      Serial.println("Failed to connect to internet!");
+    } else {
+      Serial.println("Connected to internet!");
+    }
+  } else {
+    Serial.println("Failed to connect to network!");
+  }
+}
+
+void loop() {
+  delay(20000);
+}
+
+void onEvent(arduino_event_id_t event, arduino_event_info_t info) {
+  switch (event) {
+    case ARDUINO_EVENT_PPP_START:
+      Serial.println("PPP Started");
+      break;
+    case ARDUINO_EVENT_PPP_CONNECTED:
+      Serial.println("PPP Connected");
+      break;
+    case ARDUINO_EVENT_PPP_GOT_IP:
+      Serial.println("PPP Got IP");
+      Serial.println(PPP);
+      WiFi.AP.enableNAPT(true);
+      break;
+    case ARDUINO_EVENT_PPP_LOST_IP:
+      Serial.println("PPP Lost IP");
+      WiFi.AP.enableNAPT(false);
+      break;
+    case ARDUINO_EVENT_PPP_DISCONNECTED:
+      Serial.println("PPP Disconnected");
+      WiFi.AP.enableNAPT(false);
+      break;
+    case ARDUINO_EVENT_PPP_STOP:
+      Serial.println("PPP Stopped");
+      break;
+
+    case ARDUINO_EVENT_WIFI_AP_START:
+      Serial.println("AP Started");
+      Serial.println(WiFi.AP);
+      break;
+    case ARDUINO_EVENT_WIFI_AP_STACONNECTED:
+      Serial.println("AP STA Connected");
+      break;
+    case ARDUINO_EVENT_WIFI_AP_STADISCONNECTED:
+      Serial.println("AP STA Disconnected");
+      break;
+    case ARDUINO_EVENT_WIFI_AP_STAIPASSIGNED:
+      Serial.print("AP STA IP Assigned: ");
+      Serial.println(IPAddress(info.wifi_ap_staipassigned.ip.addr));
+      break;
+    case ARDUINO_EVENT_WIFI_AP_PROBEREQRECVED:
+      Serial.println("AP Probe Request Received");
+      break;
+    case ARDUINO_EVENT_WIFI_AP_STOP:
+      Serial.println("AP Stopped");
+      break;
+
+    default:
+      break;
+  }
+}