Enable Auto Reconnect In MQTT

[zzakir]

Description:
MQTT Paho client has the option to enable auto reconnect in its options. It looks like this:

options.setAutomaticReconnect(true);

This is a useful feature and helps when the MQTT broker crashes or restarts. If this is not enabled, the siddhi application will not re connect to the broker unless we restart the siddhi application as well, which is inconvenient.

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Affected Product Version:
3.0.0

OS, DB, other environment details and versions:

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