Brother RJ-4030 - Manual (Page 33)

P-touch Template 2.0 Command Reference
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5. Precautions
5. Precautions
5.1 Notes for using Bluetooth (RJ-4030 only)
If the printer is connected using Bluetooth, the printer may not be ready immediately after the port is opened.
When sending print data, wait at least 500 msec after the port has been opened before starting to send the
data.
In addition, if the port is continuously opened and closed, for example, when printing multiple pages, wait at
least 500 msec after the port is closed before opening the port the next time.
Once the print data for one page has been sent, do not close the Bluetooth port until printing is finished.