Help about WitMotion 16 Channels

As part of my studies I decided to make a hexapod, for that I used this card:

This is a card of the brand WitMotion, the explanation pdf is the one below :

I’ve already read chapter 6 and the documentation of the pdf, with the TTL port everything works perfectly, but as soon as I switch to bluetooth nothing works, I think I do not send the information correctly:
With / without spaces
With / without hooks
In what order (speed then degree) …

Or that it is a hardware problem, I am currently using an HC-05 as bluetooth module, normally the RX / TX must be reversed, I do not know if I have to do it.
Can be a problem with the format of mailings (Hexadecimal instead of ASCII …)

I try to send several things :

0xff, 0x01, 0x00, 0x01, 0x00, 0xff, 0x02, 0x00, 0xdc, 0x05
0xff, 0x01, 0x00, 0x01, 0x00
ff 01 00 01 00 ff 02 00 dc 05
ff 01 00 01 00
ff 02 00 dc 05

Thank you very much for your help and your responsiveness, Rémy