1/31/2024 0 Comments Http sniffer macThese stacks take care of the lower levels of the BLE protocol for developers and in very many ways this is a good thing. Because of this, a lot of my focus has gone to the BLE stacks that Apple and Google have created on their platforms for application developers to use. In this project we have been tasked with implementing mobile applications for Android and iOS that used BLE to communicate with various products made by our customer. In the past two years or so I have been delving into Bluetooth Low Energy (BLE) for a project I did for one of our customers at Luminis Arnhem. ![]() Also, it some cases while iterating within the same band, setting the next channel will fail, and WiFi Explorer Pro will show less results than expected.Internet of Things Bluetooth Low Energy logging by placing a Mac-in-the-middle WiFi Explorer Pro iterates over the list of 2.4 and 5 GHz channels to listen for beacons from nearby access points, but because it cannot correctly switch channels between bands, it will only show networks found in either the 2.4 GHz or 5 GHz band, but not both. On the other hand, passive scanning in WiFi Explorer Pro doesn’t work as expected. When you do a Wi-Fi packet capture using Apple’s Sniffer utility, selecting a channel and starting the capture will work, but the packet capture will be done using the incorrect channel. The same is true for Apple’s Wireless Diagnostics. ![]() In Airtool, the capture will work, and Airtool will show that it’s capturing on the selected channel, but the packet capture will be done using a different channel. For example, if the interface is previously set to a channel in the 2.4 GHz band, selecting a channel in the 5 GHz band will likely fail. In many cases, the channel remains unchanged. However, selecting the channel doesn’t work reliably in the new M1 Mac, especially when choosing a channel from a different band. Airtool disconnects the interface and sets the channel using Apple’s CoreWLAN framework. To do a packet capture in Airtool, for example, Airtool first disconnects from the wireless network and then sets the channel we want to capture on. The 14″ and 16″ M1 MacBook Pro (2021) do not appear to be affected. However, capturing on multiple channels by doing channel hopping remains broken on the M1 MacBook Pro (2020) as macOS doesn’t switch channels across bands correctly. Update (): The latest version of macOS Big Sur appears to have fixed this issue. Packet captures don’t use the correct channel We have already reported these issues to Apple, but we’d also like to share some details to help you understand how these issues affect WiFi Explorer Pro and Airtool. We don’t know if it is because of the new chipset, the new ARM architecture, or macOS Big Sur, but something is wrong and breaks packet capturing in the M1 Mac. Same as with older Intel Macs, the new M1 Mac comes with a Broadcom Wi-Fi chipset, but it’s the first Mac compatible with 802.11ax. Unfortunately, packet capturing is now broken in the new M1 Mac. And f or years, doing Wi-Fi packet captures in the Mac has always worked reliably out of the box, and it is one of the main reasons many Wi-Fi professionals love their Macs to do their jobs. Wi-Fi professionals use packet captures to validate and troubleshoot wireless networks, including connectivity, device compatibility, roaming, configuration problems, and more. ![]() Three years later, we give you Part 2, describing two different issues now affecting packet capturing in the new M1 Macs.Ĭapturing Wi-Fi traffic is an essential task of protocol analysis. With the release of macOS Catalina in October 2019, Apple fixed two of these issues: incorrect beacon interval and missing information elements in CoreWLAN’s Wi-Fi scan results. We also submitted the corresponding bug reports to Apple and waited for a resolution. In August 2018, we wrote a blog describing several issues we found in Apple’s CoreWLAN framework and the airport command-line utility affecting Wi-Fi scanning and monitoring in the 2018 MacBook Pro and other similar models.
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