init method
Usage not used
NOTE: it is MM
This is called: placardMM'FirstActor'
Implementation
void init(Map<String, String> _placardM) {
print(' *************** affair class-init *********');
_placardM.forEach((k, v) => print('$k, $v'));
// howTo NULL Map OK .toString();
actor = _placardM['actor'].toString();
sender = _placardM['sender'].toString();
receiver = _placardM['receiver'].toString();
cmd = _placardM['command'].toString();
msg = _placardM['msg'].toString();
}