* updated from upstream

* forced connection attempt is now hardcoded in Sodaq_nbIOT::connectSocket()
* udp send recieve now works, may contain bugs on fast multiple incoming messages,
  have to check if this can be an issue or not

examples/nbIOT_serial_passthrough/nbIOT_serial_passthrough.ino

@@ -0,0 +1,86 @@
+#include <Arduino.h>
+
+#if defined(ARDUINO_AVR_LEONARDO)
+/* Arduino Leonardo + SODAQ NB-IoT Shield */
+#define DEBUG_STREAM Serial 
+#define MODEM_STREAM Serial1
+#define powerPin 7 
+
+#elif defined(ARDUINO_SODAQ_EXPLORER)
+/* SODAQ Explorer + SODAQ NB-IoT Shield */
+#define DEBUG_STREAM SerialUSB
+#define MODEM_STREAM Serial
+#define powerPin 7 
+
+#elif defined(ARDUINO_SAM_ZERO)
+/* Arduino Zero / M0 + SODAQ NB-IoT Shield */
+#define DEBUG_STREAM SerialUSB
+#define MODEM_STREAM Serial1
+#define powerPin 7 
+
+#elif defined(ARDUINO_SODAQ_AUTONOMO)
+/* SODAQ AUTONOMO + SODAQ NB-IoT Bee */
+#define DEBUG_STREAM SerialUSB
+#define MODEM_STREAM Serial1
+#define powerPin BEE_VCC
+#define enablePin BEEDTR
+
+#elif defined(ARDUINO_AVR_SODAQ_MBILI)
+/* SODAQ MBILI + SODAQ NB-IoT Bee */
+#define DEBUG_STREAM Serial
+#define MODEM_STREAM Serial1
+#define enablePin BEEDTR
+
+#elif defined(ARDUINO_SODAQ_SARA)
+/* SODAQ SARA */
+#define DEBUG_STREAM SerialUSB
+#define MODEM_STREAM Serial1
+#define powerPin SARA_ENABLE
+#define enablePin SARA_TX_ENABLE
+
+#else
+#error "Please use one of the listed boards or add your board."
+#endif
+
+unsigned long baud = 9600;  //start at 9600 allow the USB port to change the Baudrate
+
+void setup() 
+{
+#ifdef powerPin
+    // Turn the nb-iot module on
+    pinMode(powerPin, OUTPUT);
+    digitalWrite(powerPin, HIGH);
+#endif
+
+#ifdef enablePin
+    // Set state to active
+    pinMode(enablePin, OUTPUT);
+    digitalWrite(enablePin, HIGH);
+#endif // enablePin
+
+  // Start communication
+  DEBUG_STREAM.begin(baud);
+  MODEM_STREAM.begin(baud);
+}
+
+// Forward every message to the other serial
+void loop() 
+{
+  while (DEBUG_STREAM.available())
+  {
+    MODEM_STREAM.write(DEBUG_STREAM.read());
+  }
+
+  while (MODEM_STREAM.available())
+  {     
+    DEBUG_STREAM.write(MODEM_STREAM.read());
+  }
+  
+#ifndef ARDUINO_AVR_SODAQ_MBILI
+  // check if the USB virtual serial wants a new baud rate
+  if (DEBUG_STREAM.baud() != baud) {
+    baud = DEBUG_STREAM.baud();
+    MODEM_STREAM.begin(baud);
+  }
+#endif // !ARDUINO_AVR_SODAQ_MBILI
+}