What is the maximum possible payload length using RapidConnect?

Using the Custom Messaging feature in RapidConnect, you can build your own payloads that are up to 77 bytes long.

Keep in mind that Zigbee is a low-power standard, so large payload lengths are not a priority. You can learn more about this here: http://community.silabs.com/t5/Mesh-Knowledge-Base/What-is-the-maximum-ZigBee-message-payload-length-in-secure-and/ta-p/113417

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