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MAC36NL - BACnet MS/TP - High CPU load

Issue

After adding and configuring the Mstp component to the 4.7 Niagara station on the MAC36NL controller, the CPU load reaches a considerably high value (around 30, 60, or 100%) and does not fall even if the station gets cleared of all functions.

Possible cause and solution

In the firmware and OS of the Niagara 4.7.109.20 version, there is an error in BACnet MS/TP, which falsely increases the CPU load.

Solution

It is recommended to upgrade Niagara on the MAC36NL controller at least to the 4.8.0.110, version (or higher) because the bug has been fixed.

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