Firmware version : BX310x.2.6.3
When in SPP mode and sending binary data the first instance of data binary 0 caused transmission to end.
Entered SPP data mode with: AT+SRSPPSTART=1
And then start sending the data. The first transmission from BX3100 of binary 0 ends the transmission.
This appears to be a bug in the BX3100 software.
Nathan