The multiserver address format does not allow : symbols to be used, so we omit them internally.
This function adds them back in.

@param {} internalRepresentation the internal representation (e.g. 65D900DDB353)
@returns the bluetooth mac address implementation (e.g. 65:D9:00:DD:B3:53)
function toMacAddress(internalRepresentation) {
    const parts = [];

    // Take a copy of the string
    let btInternalRepresentation = internalRepresentation.slice();

    do { 
      parts.push(btInternalRepresentation.substring(0, 2)) 
    } 
    while( (btInternalRepresentation = btInternalRepresentation.substring(2, btInternalRepresentation.length)) != "" );

    return parts.join(":");
  }