Controlling Multi-Site Media Playback Systems

A non-transitory computer-readable medium, wherein the non-transitory computer-readable medium is provisioned with program instructions that, when executed by at least one processor, cause a computing system to:

• receive, from a first media playback device connected to a first local area network, a first registration message, wherein the first media playback device is configured to operate as part of a media playback system, and wherein the media playback system is configured to include media playback devices connected to one or more of the first local area network and a second local area network;
• in response to receiving the first registration message, assign a media playback system identifier and a first subsystem identifier to the first media playback device, wherein the media playback system identifier is associated with the computing system, and wherein the first subsystem identifier is associated with the media playback system identifier and the first local area network;
• receive, from a second media playback device connected to the second local area network, a second registration message;
• in response to receiving the second registration message, determine that the second media playback device is connected to the second local area network;
• based on determining that the second media playback device is connected to the second local area network, assign the media playback system identifier and a second subsystem identifier to the second media playback device, wherein the second subsystem identifier is associated with the media playback system identifier and the second local area network;
• receive a command to change a configuration setting on one or more devices associated with the second subsystem identifier but not the first subsystem identifier;
• and
• in response to receiving the command to change the configuration setting on the one or more devices associated with the second subsystem identifier, cause the second media playback device to change the configuration setting on the second media playback device without causing the first media playback device to change the configuration setting on the first media playback device.

A method carried out by a computing system, the method comprising:

• receiving, from a first media playback device connected to a first local area network, a first registration message, wherein the first media playback device is configured to operate as part of a media playback system, and wherein the media playback system is configured to include media playback devices connected to one or more of the first local area network and a second local area network;
• in response to receiving the first registration message, assigning a media playback system identifier and a first subsystem identifier to the first media playback device, wherein the media playback system identifier is associated with the computing system, and wherein the first subsystem identifier is associated with the media playback system identifier and the first local area network;
• receiving, from a second media playback device connected to the second local area network, a second registration message;
• in response to receiving the second registration message, determining that the second media playback device is connected to the second local area network;
• based on determining that the second media playback device is connected to the second local area network, assigning the media playback system identifier and a second subsystem identifier to the second media playback device, wherein the second subsystem identifier is associated with the media playback system identifier and the second local area network;
• receiving a command to change a configuration setting on one or more devices associated with the second subsystem identifier but not the first subsystem identifier;
• and
• in response to receiving the command to change the configuration setting on the one or more devices associated with the second subsystem identifier, causing the second media playback device to change the configuration setting on the second media playback device without causing the first media playback device to change the configuration setting on the first media playback device.