Network

NetworkInterfaceConfig

Since 5.3.0:

With Device OS 5.3.0 and later, this class is used to hold a configuration for network interface addresses, typically to enable static IP addressing for Ethernet or Wi-Fi instead of using DHCP.

NetworkInterfaceConfig::source

Sets the network interface to DHCP (the default), or static IP addressing. The setting is persistent and saved in the flash file system.

• NetworkInterfaceConfigSource::DHCP
• NetworkInterfaceConfigSource::STATIC

// PROTOTYPES
NetworkInterfaceConfig& source(NetworkInterfaceConfigSource source, int family = AF_INET);
NetworkInterfaceConfigSource source(int family = AF_INET) const;

// EXAMPLE - Restore DHCP addressing for Ethernet
Ethernet.setConfig(NetworkInterfaceConfig()
  .source(NetworkInterfaceConfigSource::DHCP);

NetworkInterfaceConfig::address

Sets the IP address when using static IP addressing. The setting is persistent and saved in the flash file system.

Typically you use the last overload which takes two IPAddress class references, one for the address and one for the subnet mask.

Note that the syntax {192,168,1,20} uses commas, not the more typical period or dot, because this is a C++ initializer, not a string.

// PROTOTYPES
NetworkInterfaceConfig& address(const NetworkInterfaceAddress& addr);
NetworkInterfaceConfig& address(SockAddr addr, SockAddr mask);
NetworkInterfaceConfig& address(IPAddress addr, IPAddress mask);

// EXAMPLE
Ethernet.setConfig(NetworkInterfaceConfig()
  .source(NetworkInterfaceConfigSource::STATIC)
  .address({192,168,1,20}, {255,255,255,0}));

NetworkInterfaceConfig::gateway

Sets the gateway IP address when using static IP addressing. The setting is persistent and saved in the flash file system.

Even though the parameter is a SockAddr, you can initialize the gateway address as if it were an IPAddress.

Note that the syntax {192,168,1,1} uses commas, not the more typical period or dot, because this is a C++ initializer, not a string.

When using Ethernet, if the link is active and the gateway is reachable, by default the Ethernet interface is the default route, including for the cloud connection, even if the Ethernet LAN is not connected to the Internet (isolated LAN). To prevent this behavior with Device OS 5.3.0 and later, set the gateway to {0,0,0,0} which will prevent the Ethernet interface from being used to access the Internet, including the Particle cloud. This can be done for both static and DHCP addressing. You can still access hosts on the Ethernet local LAN by TCP or UDP. You might do this for an isolated LAN that has Modbus TCP devices on it, for example. For more information, see Isolated LAN.

// PROTOTYPES
NetworkInterfaceConfig& gateway(SockAddr addr);
SockAddr gateway(int family = AF_INET) const;

// EXAMPLE
Ethernet.setConfig(NetworkInterfaceConfig()
  .source(NetworkInterfaceConfigSource::STATIC)
  .address({192,168,1,20}, {255,255,255,0})
  .gateway(SockAddr({192,168,1,1})));

// EXAMPLE - Ethernet is isolated, do not use for Internet or cloud access
Ethernet.setConfig(NetworkInterfaceConfig()
  .source(NetworkInterfaceConfigSource::STATIC)
  .address({192,168,1,20}, {255,255,255,0})
  .gateway(SockAddr({0,0,0,0})));

// EXAMPLE - Ethernet is isolated, do not use for Internet or cloud access but does have a DHCP server
Ethernet.setConfig(NetworkInterfaceConfig()
  .source(NetworkInterfaceConfigSource::DHCP)
  .gateway(SockAddr({0,0,0,0})));

NetworkInterfaceConfig::dns

Sets the DNS server address. The setting is persistent and saved in the flash file system. You can set multiple DNS server addresses if desired.

Even though the parameter is a SockAddr, you can initialize the gateway address as if it were an IPAddress.

// PROTOTYPE
NetworkInterfaceConfig& dns(SockAddr dns);

// EXAMPLE
Ethernet.setConfig(NetworkInterfaceConfig()
  .source(NetworkInterfaceConfigSource::STATIC)
  .address({192,168,1,20}, {255,255,255,0})
  .gateway(SockAddr({192,168,1,1}))
  .dns(SockAddr({192,168,1,1}))
  .dns(SockAddr({8,8,8,8})));