BT Classic connection fails for CYBT-343026-EVAL

[Yu332891]

I purchased CYBT-343026-EVAL and am trying to check the connection by sending Classic commands through TeraTerm.

However, the connection fails.

The address is correct for the connection.
The connection is to CYBT-343026-01.

Please let me know if you know how to solve this problem.

The connection is unstable, sometimes it is possible to connect.

The program in CYBT-343026-EVAL is still in the same state as shipped and no other program has been written to it.
The firmware version of CYBT-343026-EVAL is 1.2.29.

Search:
/BTI,D=5,F=1
@R,000A,/BTI,0000
@E,0027,BTINR,A=FX2XBXFX3X1X,B=00,N=WSB2051069
@E,0027,BTINR,A=X1X7XDXDX7XB,B=00,N=WSB2041003
@E,0005,BTIC

Connection:
/BTC,A=X1X7XDXDX7XB,T=1
@R,000F,/BTC,0000,C=00
@E,0011,BTCF,C=00,R=0001
@E,0012,BTDIS,C=03,R=0000

[Owen_Zhang123]

What's the peer device?

Does it support the SPP profile?

[Yu332891]

The peer device is CYBT-343026-01.

The peer device is also in the factory default state and no separate program has been written to it.

[Owen_Zhang123]

Could you share the entire log on both side?

[Yu332891]

I don't think the peer device is responding.

central:
*******************************************************************
@E,003B,BOOT,E=01021B1B,S=05020016,P=0103,H=D1,C=00,A=C44238504277
@E,000E,ASC,S=01,R=03
/BTI,D=5,F=1
@R,000A,/BTI,0000
@E,0027,BTINR,A=E167FDCD07CB,B=00,N=WSB2041003
@E,0005,BTIC
/BTC,A=E167FDCD07CB,T=1
@R,000F,/BTC,0000,C=00
@E,0011,BTCF,C=00,R=0001
@E,0012,BTDIS,C=03,R=0000

peer:
*******************************************************************
/RBT
@R,000A,/RBT,0000
@E,003B,BOOT,E=01010E06,S=05020016,P=0103,H=D1,C=00,A=E167FDCD07CB
@E,000E,ASC,S=01,R=03

[Owen_Zhang123]

Yes, you are right. It seems the peer device doesn't receive the connection request.

Could you place the two device closely and test it in a clean environment?

[Yu332891]

Tested at a distance of 3 cm with no good results.

Is there any other reason why the peer device is not accepting connection requests?

[Owen_Zhang123]

It is quite strange because we never see the connection problem between two modules. How many boards do you have for the test?

[Yu332891]

There is one peer device and five central devices.
As an example, let's name the central devices A through E and the peer device X.

1. Central device A makes a connection request to peer device X.
The connection is successful.

2. Turn off both devices and disconnect them.

3. Central device B makes a connection request to peer device X.
But the connection fails.

Central devices C, D, and E also fail to connect to peer device X.

[Owen_Zhang123]

Could you try to make the connect with a phone or other device?

Is it possible for you to catch some OTA logs?