Multiple hardware commands sent to either Lovense dongle only have the first command sent

[blackspherefollower]

Describe the bug
Testing the Gravity with both dongles, Vibrate1:N; followed quickly with Vibrate2:N; only causes the vibrator to be changed.
Both messages are sent to the dongle (as far as the trace logging can tell).

I suspect that the send needs some delay before the dongle is ready to read again (in practice 40ms works, but I bet waiting for the write response would be better)

Expected behavior
Commands should be delivered to the dongle at a rate were they're not dropped

Actual behavior
The later commands are dropped by the dongle