code: def bsend(self, picture, *args):
          
          return lib.zsock_bsend(self._as_parameter_, picture, *args)
docs: Send a binary encoded 'picture' message to the socket (or actor). This
  method is similar to zsock_send, except the arguments are encoded in a
  binary format that is compatible with zproto, and is designed to reduce
  memory allocations. The pattern argument is a string that defines the
  type of each argument. Supports these argument types:
  
   pattern    C type                  zproto type:
      1       uint8_t                 type = "number" size = "1"
      2       uint16_t                type = "number" size = "2"
      4       uint32_t                type = "number" size = "3"
      8       uint64_t                type = "number" size = "4"
      s       char *, 0-255 chars     type = "string"
      S       char *, 0-2^32-1 chars  type = "longstr"
      c       zchunk_t *              type = "chunk"
      f       zframe_t *              type = "frame"
      u       zuuid_t *               type = "uuid"
      m       zmsg_t *                type = "msg"
      p       void *, sends pointer value, only over inproc
  
  Does not change or take ownership of any arguments. Returns 0 if
  successful, -1 if sending failed for any reason.