Rather than relying on connman one could e.g. use hostapd as follows:
First plug-in your Wi-Fi stick. As the Ambicom WL250N we previously sold in our web shop has the same chip set it should be detected and driver/firmware be loaded automatically:
[ 40.583933] utmi_phy_irq: utmip remote wake detected
[ 40.588921] tegra-ehci tegra-ehci.2: remote wakeup detected
[ 40.940150] usb 2-1.3: new high speed USB device number 3 using tegra-ehci
[ 41.087508] usb 2-1.3: New USB device found, idVendor=148f, idProduct=3070
[ 41.094463] usb 2-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 41.101865] usb 2-1.3: Product: 802.11 n WLAN
[ 41.106230] usb 2-1.3: Manufacturer: Ralink
[ 41.110438] usb 2-1.3: SerialNumber: 1.0
[ 41.199845] usb 2-1.3: reset high speed USB device number 3 using tegra-ehci
root@colibri-t30:~# lsusb | grep 3070
Bus 002 Device 003: ID 148f:3070 Ralink Technology, Corp. RT2870/RT3070 Wireless Adapter
root@colibri-t30:~# ip addr | grep -A 5 wlan
10: wlan0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
link/ether 00:10:7a:4f:74:21 brd ff:ff:ff:ff:ff:ff
Secondly we make sure the IP configuration of your Wi-Fi stick is taken care of by systemd-networkd requiring the following configuration file to be added:
Optionally the above would allow to enable e.g. IP forwarding as well as explained in its documentation.
As there seems to be sort of a race condition in bringing the Wi-Fi interface up modify the systemd-networkd.service file by adding the following ExecStartPre to its [Service] section as a workaround:
ExecStartPre=/sbin/ip link set wlan0 up
Restart the systemd-networkd service:
root@colibri-t30:~# systemctl restart systemd-networkd
Unfortunately as the hostapd package is not available in any pre-compiled binary Angstrom feed as of yet one will have to do a custom Angstrom/OpenEmbedded/Yocto build including hostapd as explained on our developer website.
Alternatively install the following hostapd package (regular wired Ethernet connection required as further package dependencies need to be downloaded/installed as well):
root@colibri-t30:~# opkg update
root@colibri-t30:~# opkg install hostapd_2.4-r0.0_armv7at2hf-vfp-neon.ipk
As the hostapd startup may suffer from a race condition on the Wi-Fi interface having been brought up by systemd-networkd one can adjust its configuration by Removing After=network.target from its [Unit] section and instead adding After/BindsTo as follows:
Adjust the following configuration file to your liking and deploy it to /etc/hostapd.conf.
Start and/or enable the hostapd as a systemd service:
root@colibri-t30:~# systemctl start hostapd
root@colibri-t30:~# systemctl enable hostapd
And you should be all set.