Scalability Tab

Specify if the Robot service should subscribe to Orchestrator's SignalR channels, and configure the transport protocols that work best for you. These settings are preserved upon upgrading.

SignalR (Robots)

Field	Description
Enabled	This toggle specifies if the Robot service subscribes to Orchestrator's SignalR channels or not. By default, this setting is enabled, and all available channels are selected: WebSocket Server-Sent Events (SSE) Long Polling When all transport channels are enabled, the best available transport is automatically selected, in the following priority order: WebSocket > Server-Sent Events > Long Polling. If the first protocol is not available for any reason, the next in line (if enabled) is used to facilitate the communication between Orchestrator and Robot.
WebSocket	When selected, enables the WebSocket transport protocol to be used to connect the Robot to Orchestrator's SignalR channels. This is the highest protocol used in the order of priority due to its performance and support for simultaneous communication in both directions - from the Robot service to Orchestrator and vice versa. This option cannot be used if the SignalR (Robots) feature is not enabled.
Server-Sent Events (SSE)	When selected, enables the Server-Sent Events (SSE) push technology to be used to connect the Robot to Orchestrator's SignalR channels. This is the first backup in case WebSockets is not available for any reason. This option cannot be used if the SignalR (Robots) feature is not enabled.
Long Polling	When selected, enables the long polling transport protocol to be used to connect the Robot to Orchestrator's SignalR channels. This protocol is used in case the WebSockets and SSE ones are not available. This option cannot be used if the SignalR (Robots) feature is not enabled.