Bluetooth BLE/52832/ Try to implement FTMS control point with Zwift

Question

Behaviour:

- Bluefruit the feater (nRF82832)

- Bluetooth BLE

- Implementation of Fitness Machine Service (0x1826)

- What is correct : all characteristics notified to the client

- What is wrong : the implementation of the flow char of control point characteristic (0x2AD9)

I think now i understood the concept of control point.

I receive a write from the client into it and i try to answer with an indication.

But the client don't continue the configuration of the control point.

I think it should write 04 to set the resistance level, but it didn't

I give you the sequence diagram beetween client and server.

Maybe you can tell me what is wrong

Thank you

Vincent

Implementation of Fitness Machine Control Point
Specification : Fitness Machine Service (0x1826)

Zwift(Client) HomeTrainer(Server) Meaning

FTMS.CtlPt(0x2AD9) write(7) Start or Resume a training session
------------------------------------------------------------------>

FTMS.CtlPt(0x2AD9) indicate(0x8001) Reply: OpCode=0x80 and ResultCode=0x01
<------------------------------------------------------------------

FTMS.CtlPt(0x2AD9) write(0) Request Control: initiate the procedude to request the control

------------------------------------------------------------------> of the fitness machine

FTMS.CtlPt(0x2AD9) indicate(0x8001) Reply: OpCode=0x80 and ResultCode=0x01
<------------------------------------------------------------------

Remarques:

1- In the server software the source is the following:

call back OnWrite (characteristic FTMS control point (2AD9):
indicate16 (0x8001) //renvoit 2 octets 0x80 and 0x01

2-I tried to indicate 0x0180, but without any success
3- The structure to indicate to the client is (in my opinion) the following:

   struct
   { OPCODE: uint8  //0x80 (cf specification p 50/78)
RESULTCODE: uint8  //0X01=SUCCESS
}

4 - the initialisation of the control point is the following:

//control point pour le controle de la resistance par zwift
    m_ControlPoint.setProperties(CHR_PROPS_NOTIFY |CHR_PROPS_WRITE |CHR_PROPS_INDICATE |CHR_PROPS_READ );
    m_ControlPoint.setPermission(SECMODE_OPEN, SECMODE_OPEN);
    m_ControlPoint.setWriteCallback(fctWriteCallback);
    m_ControlPoint.setCccdWriteCallback(fctCCCdCallback); // Optionally capture CCCD updates   ?????
    m_ControlPoint.setFixedLen(2);