Request network selection mode

This sample application demonstrates how to request current network selection mode.

1. Get phone factory and network selection manager instances

auto &phoneFactory = telux::tel::PhoneFactory::getInstance();
std::promise<telux::common::ServiceStatus> prom;
auto networkMgr = phoneFactory.getNetworkSelectionManager(DEFAULT_SLOT_ID,
    [&](telux::common::ServiceStatus status) {
        prom.set_value(status);
});

2. Wait for the network selection subsystem initialization

telux::common::ServiceStatus networkSelMgrStatus = prom.get_future().get();

3. Exit the application, if network selection subsystem can not be initialzed

if (networkSelMgrStatus == telux::common::ServiceStatus::SERVICE_AVAILABLE) {
    std::cout << "Network Selection Manager is ready " << "\n";
} else {
    std::cout << "ERROR - Unable to initialize,"
        << " network selection manager subsystem " << std::endl;
    return 1;
}

4. Implement response callback to receive response for request network selection mode

class SelectionModeResponseCallback {
public:
   void selectionModeResponse(
      telux::tel::NetworkModeInfo info,
      telux::common::ErrorCode errorCode) {
      if(errorCode == telux::common::ErrorCode::SUCCESS) {
         std::cout << "Network selection mode: "
                   << static_cast<int>(info.mode)
                   << std::endl;
         if (networkSelectionMode == NetworkSelectionMode::MANUAL) {
             std::cout << "MCC is: " << info.mcc << ", MNC is: " << info.mnc << std::endl;
         }
      } else {
         std::cout << "\n requestNetworkSelectionMode failed, ErrorCode: "
                   << static_cast<int>(errorCode)
                   << std::endl;
      }
   }
};

5. Send requestNetworkSelectionMode along with response callback

if(networkMgr) {
   auto status = networkMgr->requestNetworkSelectionMode(
      SelectionModeResponseCallback::selectionModeResponse);
   std::cout << static_cast<int>(status) <<std::endl;
   }
}

Now, selectionModeResponse() callback gets invoked with current network selection mode information.