attachment status

One problem with the MKRNB is that sometimes when the sim card inside of the MKRNB has the status of attached, which essentially means that the sim card will be attached to the MCU, this can cause connections issues, so if you accidentally attached it, you can now easily check the status

Author: Marcus Peterson

src/GPRS.cpp

@@ -162,6 +162,37 @@ int GPRS::ready()
   return ready;
 }
 
+//Check to see if the sim card that is inside the MKRNB is attached or detached to a LTE-M provideer
+NB_NetworkStatus_t GPRS::checkAttachmentStatus()
+{
+  MODEM.setResponseDataStorage(&_response);
+  MODEM.send("AT+CGATT?");
+  _state = GPRS_STATE_WAIT_CHECK_ATTACHED_RESPONSE;
+  
+  int ready = 0;
+  
+  while (ready == 0) {
+    ready = MODEM.ready();
+    
+    if (ready > 1) {
+      _state = GPRS_STATE_IDLE;
+      _status = NB_ERROR;
+      break;
+    }
+    
+    delay(500);
+  }
+  
+  if (_response.indexOf("1,1") >= 0) {
+    _state = GPRS_STATE_IDLE;
+    return GPRS_READY;
+  } else {
+    _state = GPRS_STATE_IDLE;
+    return IDLE;
+  }
+}
+
+
 IPAddress GPRS::getIPAddress()
 {
   String response;

src/GPRS.h

@@ -63,6 +63,8 @@ class GPRS {
    */
   NB_NetworkStatus_t detachGPRS(bool synchronous = true);
 
+  NB_NetworkStatus_t checkAttachmentStatus();
+
   /** Get actual assigned IP address in IPAddress format
       @return IP address in IPAddress format
    */