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The HC-05 may only have implemented baud rates up to 1382400, even though the protocol is spec'd for up to 128000. If you're using Software Serial to talk to the HC-05 from an Uno, 9600 baud is about as fast as SoftwareSerial can keep up with incoming bytes (I've heard from some people that 19200 will work). If you're using one of the UARTs on a Mega, you ...

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