NEHotspotNetwork BSSID missing first character?

Question

please consider this code:

[NEHotspotNetwork fetchCurrentWithCompletionHandler:^(NEHotspotNetwork *network) {
            if (network) {
                DebugLog(@"Network ssid: %@, bssid: %@", network.SSID, network.BSSID);                
            } else {
                DebugLog(@"No available network");              
            }
        }];

For me, I have a strange situation - say that the BSSID of my network is "01:34:56:78:90"

the string in the property is missing the first character! what is contains (and is printed) is "1:34:56:78:90" - the leading "0" is missing.

So, I was wondering if this is a know thing, or if perhaps it's only Asus (my router)? Or, am I doing something wrong?

Pointers would be much appreciated.

313

Posted by

Mathias_

Reply

Add a Comment

Answer 1

BSSIDs are MAC addresses, which means the on-the-wire format is 6 bytes of data. The BSSID property is rendering that in the traditional way, that is, rendering each byte in hex and inserting a colon between them.

Except that there are two traditional ways (-: one that includes leading zeroes and one that doesn’t, and it looks like NE has chosen the latter. If need the former, you can add back in the leading zero with code like this:

let fixed = bssid
    .split(separator: ":", omittingEmptySubsequences: false)
    .map { "00\($0)".suffix(2) }
    .joined(separator: ":")

You could reasonably file a bug requesting that we add the leading zeroes always. If you do that, please post your bug number, just for the record. It’ll be interesting to see how that pans out, as I could imagine the fix breaking other folks who rely on the current behaviour.

FWIW, I personally prefer to have the leading zeroes (-:

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

Posted by

eskimo

Add a Comment

Answer 2

Thanks Quinn for the great explanation. If I really need it I'll file a bug report. Have a great day.

Posted by

Mathias_

Add a Comment

NEHotspotNetwork BSSID missing first character?

Replies