A signaling server is used for negotiating the terms of the peer-to-peer WebRTC connection. It typically supports features such as discovery of other available clients and creation of secure channels for negotiation.
This signaling client only works for reaching contacts in the current browser instance. It should be used for testing purposes or in parallel with other client types to create a local client with the same interface as your remote clients.
This signaling client uses PubNub as a signaling server. The prefilled credentials are from my personal free trial and may fail due to usage limits. You can create your own credentials on the platform directly.