add messages to a queue that are not text messages.
view one of those message by using "Browse queue" and then selecting "show" on an specific message.
the console will use a hex-dump to show the message content.
in there, bytes with a value >= 128 are treated as negative numbers.
but byte arrays are typically represented as unsigned numbers, and the comment "hex and must be 2 digit so they space out evenly" in `browse,js` also seems to indicate that that was intended.