var configA = ConfigParams.fromTuples([
  'host', 'broker1,broker2',
  'port', '8082',
  'username', 'user2',
  'password', 'pass123',
  'param1', 'ABC',
  'param2', 'XYZ',
  'param3', 'p3A'
]);

var configB = ConfigParams.fromTuples([
  'host', 'broker3,broke42',
  'port', '8083',
  'username', 'user2',
  'password', 'pass1234',
  'param1', 'ABCD',
  'param2', 'WXYZ',
  'param3', 'p3B'
]);
  
var config = ConnectionUtils.concat(configA, configB, ['username', 'password']);