Add initial support for Thinger NB-IOT Core and update version to 2.40.0

Author: alvarolb

.gitignore

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 .vscode/settings.json
-.DS_Store
+.DS_Store
+.idea

CHANGELOG.md

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+## 2.40.0
+
+#### NB-IOT CORE
+
+- **Added** initial support for [Thinger NB-IOT Core](https://docs.thinger.io/others/hardware/thinger32-nb-iot). A module based on BC660 using Narrowband Technology.
+
 ## 2.31.0
 
 #### ESP32

examples/Thinger/NBCore/NBCore.ino

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+
+// uncomment to use custom iot server
+//#define THINGER_SERVER "acme.thinger.io"
+
+// uncomment to enable thinger debug messages
+#define THINGER_SERIAL_DEBUG
+
+// use only if using M2 based module
+// #define THINGER_NB_M2_CORE
+
+// Requires TinyGSM (https://github.com/vshymanskyy/TinyGSM)
+#include <ThingerNBCore.h>
+#include <ThingerESP32OTA.h>
+#include "arduino_secrets.h"
+
+ThingerNBCore thing(USERNAME, DEVICE_ID, DEVICE_CREDENTIAL);
+ThingerESP32OTA ota(thing, 512);
+
+String iccid;
+
+void setup(){
+    Serial.begin(115200);
+
+    // start modem
+    while (!thing.init_modem()){
+        delay(1000);
+    }
+
+    // read SIM ICCID (sim card ID)
+    iccid = thing.get_sim_iccid();
+    THINGER_DEBUG_VALUE("NB-IOT", "SIM ICCID: ", iccid.c_str());
+
+    // set username and password with ICCID
+    thing.set_credentials(USERNAME, iccid.c_str(), iccid.c_str());
+
+    // sample device resources
+    thing["voltage"] >> outputValue(thing.get_batt_voltage());
+    
+    thing["operator"] >> outputValue(thing.get_operator());
+
+    thing["modem"] >> [](pson &out)
+    {
+        out["modem"] = thing.get_modem_info();
+        out["IMEI"] = thing.get_modem_imei();
+        out["CCID"] = thing.get_sim_iccid();
+        out["operator"] = thing.get_operator();
+    };
+}
+
+void loop(){
+    // iotmp handle
+    thing.handle();
+}

library.properties

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 name=thinger.io
-version=2.31.0
+version=2.40.0
 author=Alvaro Luis Bustamante <[email protected]>
 maintainer=Thinger.io <[email protected]>
 sentence=Arduino library for IOTMP protocol used on Thinger.io IOT Platform.