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The apparent anomalies with connman may be because there are conflicts between the network configuration stored in /etc/network/interfaces and the connman configuration. Connman does not use /etc/network/interfaces to store config.
Interestingly I inserted a new D-Link DWA-131 wireless dongle with a rtl8192SU chipset into my kiwisdr and this appears as wlan2 with an "ifconfig -a" command. (This chipset works well with the firmware-realtek driver)
I chased this down to a udev rule that seemingly creates a new wlan interface number each time a new mac address is encountered.
In /etc/udev/rules.d I can see three udev rules, one for each of the three wireless dongles which have successfully worked in the kiwisdr
I've compiled a new kernel module for a rtl 8192EU chipset, so using the "theory" above this might just appear as wlan3 when the new dongle is inserted - that's if the new 8192eu.ko module is accepted !