The Settings > Command Retry page allows you to enable or disable the command retry feature for individual devices or all supported devices of the supported protocols.
The Enable All buttons enable all currently added devices of the specified protocol for this feature. This does not affect devices of any protocol that you add in the future.
Individual devices can be added or removed using the Add/Remove button towards the bottom of the page. Select Save to save changes when done. Supported devices can also be enabled or disabled for this feature using the Enable command retry preference on their device detail page. If a device does not appear in the list to add to this feature (or offer the preference on its device detail page), it is not supported (for one of the above reasons).
Command retry will attempt to re-execute a command up to five times if the expected state change is not reported by the device (driver) in the allotted time. The amount of time between retries varies based on the type of device (e.g., shades are allowed longer due to travel time than an on/off switch) and how many retries have already been attempted (each retry waits longer than the previous attempt before the command is attempted again).
This feature is disabled by default. We suggest enabling it on a device-by-device basis if you encounter a need (e.g., a device that does not always respond on the first try for some reason). In general, it is better to troubleshoot a device or mesh/network problem first (for example, see How to Build a Solid Zigbee Mesh and How to Troubleshoot Z-Wave), but this feature can be helpful if other efforts are not successful.
We encourage testing device behavior after enabling the feature. Most devices of supported types should work well with this feature (and if the command succeeds on the first try within the allotted time — and the driver reports this — Command Retry will not change anything at all). However, some devices may require particular attention, for example, switches that control gates, garage doors, or are used for similar momentary or actuator purposes.