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Bluetooth LE API
How to interact with the Amp over Bluetooth Low Energy
When you connect to the Amp over Bluetooth LE, it will try to negotiate an MTU of up to 512 bytes. This leaves you with a packet size of 509 bytes per transmission.
Check the platform you're developing on for MTU restrictions (e.g. iOS limits MTU to 185 bytes max giving you a packet size of 182 bytes)