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Adaptive KeepAlive

Adaptive keepalive is a feature in the Courier library which tries to find the most optimal keepalive interval for a client on a particular network. This helps us in optimising the number of ping requests sent over the network and keeping the connection alive.

You can read about Adaptive KeepAlive in detail here.

Usage​

To enable adaptive keepalive for your Courier connection, you just need to pass AdaptiveKeepAliveConfig inside ExperimentConfigs.

This will create a new connection having the same connect options as the original connection. Only the client id for this new connection is changed by appending the :adaptive suffix to the original client id.

AdaptiveKeepAliveConfig​

AdaptiveKeepAliveConfig has the following configs:

  • lowerBoundMinutes : Lower bound of the window in which optimal keepalive interval has to be searched.

  • upperBoundMinutes : Upper bound of the window in which optimal keepalive interval has to be searched.

  • stepMinutes : Step size with which keep alive interval is incremented while searching for the optimal keepalive interval.

  • optimalKeepAliveResetLimit : Once optimal keepalive interval is found, it will be reset if it keeps failing beyond optimalKeepAliveResetLimit.

  • pingSender : Implementation of ping sender used for sending ping requests over the new MQTT connection used for finding the optimal keepalive interval.