appendInfo method
Implementation
void appendInfo({
String? role,
String? coturnIp,
String? turnUsername,
String? turnCredential,
}) {
if (role != null) _role = role;
if (coturnIp != null) _coturnIp = coturnIp;
if (turnUsername != null) _turnUsername = turnUsername;
if (turnCredential != null) _turnCredential = turnCredential;
}