whole_func_string: function source(message) {
    var ip = [];
  
    for (var i = 0; i < 4; i++) ip.push(message[i]);
  
    return ip.join('.');
  }
func_code_string: function source(message) {
    var ip = [];
  
    for (var i = 0; i < 4; i++) ip.push(message[i]);
  
    return ip.join('.');
  }
func_documentation_string: Return message sender IP address
  
  @param  {Buffer} message
  @return {String}