can't send data through l2cap raw socket for local controller - [Errno 107] Transport endpoint is not connected

Question

I tried to connect to my local bluetooth controller through l2cap layer in order to see which services I am supporting by using SDP protocol. **don't want to use sdptool

with socket.socket(socket.AF_BLUETOOTH, socket.SOCK_RAW, socket.BTPROTO_L2CAP) as l2cap_sock:
      l2cap_sock.bind((local_bd_addr,0))
      l2cap_sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
      l2cap_sock.send(b'SDP PAYLOAD')
      

ERROR Result:

[Errno 107] Transport endpoint is not connected

any ideas, thanks