diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..f9d4530
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "lib/TinyGSM"]
+	path = lib/TinyGSM
+	url = git@github.com:lewisxhe/TinyGSM-fork.git
diff --git a/lib/TinyGSM b/lib/TinyGSM
new file mode 160000
index 0000000..2aadd86
--- /dev/null
+++ b/lib/TinyGSM
@@ -0,0 +1 @@
+Subproject commit 2aadd8611f0e22d8ba8b8091a1ce6f908ca17425
diff --git a/platformio.ini b/platformio.ini
index 778fba8..f864c60 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -8,9 +8,16 @@
 ; Please visit documentation for the other options and examples
 ; https://docs.platformio.org/page/projectconf.html
 
+[platformio]
+default_envs = esp32s3box
+
 [env:esp32s3box]
 platform = espressif32
 board = esp32s3box
 framework = arduino
-
-monitor_speed=115200
+monitor_speed = 115200
+build_unflags = -DBOARD_HAS_PSRAM
+board_build.psram_type = disabled
+lib_deps = 
+	vshymanskyy/StreamDebugger@^1.0.1
+	arduino-libraries/ArduinoHttpClient@^0.6.1
diff --git a/src/main.cpp b/src/main.cpp
index 0e44a7a..b70e494 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,11 +1,155 @@
 #include <Arduino.h>
 
-void setup() {
-  // put your setup code here, to run once:
+#define SerialMon Serial0
+#define SerialAT Serial1
+
+#define MODEM_DEBUG
+
+#ifdef MODEM_DEBUG
+  #define TINY_GSM_DEBUG SerialMon
+#endif
+
+#define TINY_GSM_MODEM_SIM7600
+#define TINY_GSM_USE_GPRS true
+#define TINY_GSM_USE_WIFI false
+#include <TinyGsmClient.h>
+
+#define MODEM_RX 17
+#define MODEM_TX 18
+#define MODEM_BAUD 115200
+
+const char apn[]  = "pwg";
+
+#ifdef MODEM_DEBUG
+  #include <StreamDebugger.h>
+  StreamDebugger debugger(SerialAT, SerialMon);
+  TinyGsm modem(debugger);
+#else
+  TinyGsm modem(SerialAT);
+#endif
+
+TinyGsmClient client(modem);
+
+
+void checkConnection() {
+  SerialMon.println("Pinging httpbin.org...");
+  
+  String resolved_ip_addr;
+  uint32_t rep_data_packet_size;
+  uint32_t tripTime;
+  uint8_t TTL;
+
+  int pingResult = modem.ping("httpbin.org", resolved_ip_addr, rep_data_packet_size, tripTime, TTL);
+  if (pingResult == 1) {
+    SerialMon.println("Ping successful!");
+    SerialMon.print("Resolved IP: ");
+    SerialMon.println(resolved_ip_addr);
+    SerialMon.print("Reply Data Packet Size: ");
+    SerialMon.println(rep_data_packet_size);
+    SerialMon.print("Round Trip Time (ms): ");
+    SerialMon.println(tripTime);
+    SerialMon.print("TTL: ");
+    SerialMon.println(TTL);
+  } else {
+    SerialMon.print("Ping failed with result code: ");
+    SerialMon.println(pingResult);
+  }
   
 }
 
-void loop() {
-  // put your main code here, to run repeatedly:
+
+void setup() {
+  SerialMon.begin(115200);
+  SerialMon.println("Init...");
   
+  SerialAT.begin(MODEM_BAUD, SERIAL_8N1, MODEM_RX, MODEM_TX);
+  
+  delay(3000);
+  
+  SerialMon.println("Serial initialized. Now restarting modem...");
+  modem.restart();
+  
+  SerialMon.println("Modem restarted. Initializing modem...");
+
+  modem.init();
+  SerialMon.println("Modem initialized.... Modem info:");
+
+  String info = modem.getModemInfo();
+  SerialMon.println(info);
+
+
+  SerialMon.println("Getting SIM status...");
+
+  if (modem.getSimStatus() != SIM_READY) {
+    SerialMon.println("SIM not ready!");
+    while (true);
+  }
+
+  SerialMon.println("SIM ready. Setting Network mode...");
+
+  if (!modem.setNetworkMode(MODEM_NETWORK_AUTO)) {
+    Serial.println("Set network mode failed!");
+  }
+  String mode = modem.getNetworkModeString();
+  SerialMon.print("Current network mode : ");
+  SerialMon.println(mode);
+
+  SerialMon.println("Setting APN...");
+
+  if (!modem.setNetworkAPN(apn)) {
+    SerialMon.println("Setting APN failed!");
+    while (true);
+  }
+
+  SerialMon.println("APN Set. Waiting for registration...");
+
+  int16_t sq;
+  RegStatus status = REG_NO_RESULT;
+  while (status == REG_NO_RESULT || status == REG_SEARCHING || status == REG_UNREGISTERED) {
+    status = modem.getRegistrationStatus();
+    switch (status) {
+      case REG_UNREGISTERED:
+      case REG_SEARCHING:
+        sq = modem.getSignalQuality();
+        SerialMon.printf("[%lu] Signal Quality:%d\n", millis() / 1000, sq);
+        delay(1000);
+        break;
+      case REG_DENIED:
+        SerialMon.println("Network registration was rejected, please check if the APN is correct");
+        return ;
+      case REG_OK_HOME:
+        SerialMon.println("Online registration successful");
+        break;
+      case REG_OK_ROAMING:
+        SerialMon.println("Network registration successful, currently in roaming mode");
+        break;
+      default:
+        SerialMon.printf("Registration Status:%d\n", status);
+        delay(1000);
+        break;
+    }
+  }
+
+  String ueInfo;
+  if (modem.getSystemInformation(ueInfo)) {
+    SerialMon.print("Inquiring UE system information:");
+    SerialMon.println(ueInfo);
+  }
+
+  if (!modem.setNetworkActive()) {
+    SerialMon.println("Enable network failed!");
+  }
+  delay(5000);
+
+  String ipAddress = modem.getLocalIP();
+  SerialMon.print("Network IP:"); 
+  SerialMon.println(ipAddress);
+
+  checkConnection();
+}
+
+
+
+void loop() {
+
 }
\ No newline at end of file