text: // The MIT License (MIT)
  //
  // Copyright (c) 2017 THINK BIG LABS SL
  // Author: alvarolb@gmail.com (Alvaro Luis Bustamante)
  //
  // Permission is hereby granted, free of charge, to any person obtaining a copy
  // of this software and associated documentation files (the "Software"), to deal
  // in the Software without restriction, including without limitation the rights
  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  // copies of the Software, and to permit persons to whom the Software is
  // furnished to do so, subject to the following conditions:
  //
  // The above copyright notice and this permission notice shall be included in
  // all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  // THE SOFTWARE.
  
  #ifndef THINGER_LINKITONE_H
  #define THINGER_LINKITONE_H
  
  #include "ThingerClient.h"
  
  class ThingerLinkItOneGPRS : public ThingerClient {
  
  public:
      ThingerLinkItOneGPRS(const char* user, const char* device, const char* device_credential) :
              ThingerClient(client_, user, device, device_credential), connected_(false),
              apn_(NULL), user_(NULL), password_(NULL), pin_(NULL)
      {}
  
      ~ThingerLinkItOneGPRS(){
      }
  
  protected:
  
      virtual bool network_connected(){
          return connected_;
      }
  
      virtual bool connect_network(){
          unsigned long gprs_timeout = millis();
          THINGER_DEBUG("NETWORK", "Connecting to GPRS...");
          while(!attachGPRS())
          {
              if (millis() - gprs_timeout > 30000) return false;
              delay(500);
          }
          connected_ = true;
          THINGER_DEBUG("NETWORK", "Connected to GPRS!");
          return connected_;
      }
  
      virtual bool secure_connection(){
          return false;
      }
  
  public:
      void set_apn(const char* apn, const char* user=NULL, const char* password=NULL){
          apn_ = apn;
          user_ = user;
          password_ = password;
      }
  
      void set_pin(const char* pin){
          pin_ = pin;
      }
  
  private:
      bool connected_;
      LGPRSClient client_;
      const char* apn_;
      const char* user_;
      const char* password_;
      const char* pin_;
  
      bool attachGPRS(){
          if(apn_!=NULL){
              return LGPRS.attachGPRS(apn_, user_, password_) == 1;
          }
          else{
              return LGPRS.attachGPRS() == 1;
          }
      }
  };
  
  #endif