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When Metric Timestamp Validation is enabled at MQTT Engine, tag writes will only occur if the new incoming metric timestamp is newer than the current tag timestamp.

In some instances, even when using a NTP time sync, there can be a clock skew of several milliseconds between the Edge and the Engine gateways.

How It Works

MQTT Engine will perform writes on a tag up to N milliseconds before the current tag timestamp where N is the metricTimestampValidationSkew.

Usage

1. On the MQTT Engine 'General' configuration tab, under the Advanced section, set 'Custom Properties' to be the following string: { "metricTimestampValidationSkew" : xxxx } where xxxx represents the skew amount in milliseconds. For example, the configuration below sets the metricTimestampValidationSkew to 50 milliseconds
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