My inference of the interactive RN4020 commands required for achieving the equivalent of Brandon Schell's YouTube demo script are:

One-time factory reset the device and disable all services:

SF,1
SS,00000000
SR,00000000
R,1

Set the Manufacturer-Specific data and start transmitting:

N,11223344
A

To change the Manufacturer-Specific data, one must disable advertising:

Y

and then use N and A again to set the new data and start advertising it. The order of commands is critical; N must only be used when advertising is not active for the data to be updated.

The interval of the transmissions (and in turn the resultant power consumption) can be altered by providing arguments to A.

.

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