anchor.diff:  -export([set_fan_speed/1]).
   
   -record(st, {
  -	  iface = undefined,
  +	  iface = 0,
   	  unknown1 = 0,
   	  air_distribution = 0,
   	  unknown2 = 0,
  
positive.code:       len = 8,
        ts = 0
       },
      io:format("jlrdemo_can:handle_call({set_fan_speed}, ~p) ~p, ~p~n",
  	      [Speed, Frame, CanFrame]),
  
      can:send(CanFrame),
      { reply, ok, St#st { fan_blower_speed = Speed }};
  
negative.code:     io:format("jlrdemo_can:handle_call(start_can, ~p, ~p, ~p)~n",
  	      [Interface, Driver, OldInterface]),
      case OldInterface of
  	0 ->
  	    true;
  	_ ->
  	    can_sock:stop(OldInterface)
  