Python script to create, using dbus, an adhoc wifi connection

adhoc.py

import dbus

bus = dbus.SystemBus()
wpas_obj = bus.get_object("fi.w1.wpa_supplicant1",
                          "/fi/w1/wpa_supplicant1")

wpas = dbus.Interface(wpas_obj, "fi.w1.wpa_supplicant1")
path = wpas.CreateInterface({'Ifname':"wlan0"})
if_obj = bus.get_object("fi.w1.wpa_supplicant1", path)
path = if_obj.AddNetwork({
   'ssid':"adhocname",
   'mode':1,
   'frequency':2412,
   'proto':"WPA",
   'key_mgmt':"NONE",
   'pairwise':"NONE",
   'group':'TKIP',
   'psk':"verysecret123",
}, dbus_interface="fi.w1.wpa_supplicant1.Interface")

network = bus.get_object("fi.w1.wpa_supplicant1", path)
network.Set("fi.w1.wpa_supplicant1.Network", "Enabled", True, dbus_interface=dbus.PROPERTIES_IFACE)
print(network.GetAll("fi.w1.wpa_supplicant1.Network", dbus_interface=dbus.PROPERTIES_IFACE))

I've made some minor changes; it works for me on Fedora 28. You should run this script as root, edit the interface (wlan0) and if it fails somewhere, restart wpa_supplicant and rerun the script. You might also want to make the interface unmanaged for NetworkManager by adding:

[keyfile]
unmanaged-devices=mac:00:11:22:33:44:55

to /etc/NetworkManager/NetworkManager.conf

I'm running Ubuntu 16.04. I'll try what you said, thanks.