[njakts]

  // ask protocol
  //elm_command(str, PSTR("ATDPN\r"));
  // str[0] should be 'A' for automatic
  // set header to talk directly to ECU#1
//  if(str[1]=='1')  // PWM
 //   elm_command(str, PSTR("ATSHE410F1\r"));
  //else if(str[1]=='2')  // VPW
  //  elm_command(str, PSTR("ATSHA810F1\r"));
 // else if(str[1]=='3')  // ISO 9141
  //  elm_command(str, PSTR("ATSH6810F1\r"));
 // else if(str[1]=='6')  // CAN 11 bits
 //   elm_command(str, PSTR("ATSH7E0\r"));
 // else if(str[1]=='7')  // CAN 29 bits
  //  elm_command(str, PSTR("ATSHDA10F1\r"));
#endif

after this my obduino started to work.
I had trouble with re-init after engine restart, so after each engine start I had to restart obduino to initialize again.