![]() Once the connection is established on our side, it's stable. However, while it's trying, and before it fails - if you turn on the device and enable RFCOMM, there is a chance you can successfully establish the socket connection. ![]() In order to successfully connect on our side, we normally turn off the device, then try to initiate a connection in the OS (which will try for a while but fail since the device is off). If anyone's device uses both SPP/Battery level, this may be the issue you are facing. It may simply be a coincidence, but in the past we have observed similar issues when trying to connect within our application both BLE Battery service and classic BT SPP at the same time. In the cases where we managed to connect RFCOMM, the battery % was not displayed next to the device after connection in the Bluetooth menu. An example might be if the OS steals the BLE connection to fetch battery level, preventing us to access the classic bluetooth service SPP. I cannot confirm this for certain, but it's likely that something is blocking the connection to RFCOMM socket on the OS side. macOS 12.0.1 is the first public Monterey release, comes in at about 12GB in size, and you’ll need a bit more disk. ![]() Apple recommends having around 20GBs of free hard drive space to install new OS update. However, this only happens when we "beat" the OS to the punch, and manage to open the socket before it gets "locked". Should I upgrade to macOS Monterey How to install macOS Monterey on your Mac. macOS Monterey won’t install If you were in the middle of updating your Mac, but the macOS Monterey installation failed, here are a few things you could try: Make sure you have enough space. pairedDevices() has been working properly.įinally, we have found that under a specific set of circumstances, we are able to connect to RFCOMM. We used to look at recentDevices() to connect, and the function failed to return recent devices. The SDP protocol we had in place did not work exactly the same - we did not receive an event when SDP completed, which caused our app to fail to try a connection (first issue) ![]() We have failed to open socket connection since the upgrade to macOS Monterey. I'm not sure yet if it's related or not - but on our side we are normally connecting to RFCOMM over Bluetooth (SPP protocol) for our device. ![]()
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