Modular PR1: NetMgr, HttpClient, SmsMgr with working attach/HTTP/SMS

CAR_GPS_TRACKER.ino

@@ -1,9 +1,26 @@
-#include "app/App.hpp"
+#include "src/core/NetMgr.hpp"
+#include "src/core/HttpClient.hpp"
+#include "src/core/SmsMgr.hpp"
+
+static const char* APN      = "hologram";
+static const char* BASE_URL = "http://laravel-server.lab.audasmedia.com.au";
+static const char* PATH     = "/api/gps";
 
 void setup() {
-  App::instance().setup();
+  Serial.begin(115200);
+  Serial2.begin(9600, SERIAL_8N1, 16, 17); // RX=16, TX=17
+
+  NetMgr::powerOnSIM7080(4);               // PWRKEY pin 4
+  NetMgr::attachAndPdp(APN);               // LTE reg + CNACT + DNS
+  SmsMgr::setup();                         // enable text mode + URCs
+
+  String json = "{\"device_id\":\"sim7080g-01\",\"lat\":-33.865143,"
+                "\"lng\":151.2099,\"speed\":12.5,\"altitude\":30.2}";
+  HttpClient::postJson(BASE_URL, PATH, json);
 }
 
 void loop() {
-  App::instance().loop();
+  SmsMgr::pollUrc();   // non‑blocking URC scan; handles +CMTI
+  SmsMgr::pollUnread(); // optional safety poll
+  delay(250);
 }