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| $upnp.isGatewayAvailable Returns if a UPnP-capable gateway has been found on the local network | 
| Usage | 
| <bool> $upnp.isGatewayAvailable() | 
| Description | 
| Returns if a UPnP-capable gateway has been found on the local network. If this function returns false (0), no other command or function from the UPnP module will work. |