USB networking: tethering

We want connect a computer through USB with our BQ, run TCP/IP over the link, perhaps even through this to Internet, like this:
netbook ---(USB)---> BQ ---(data mobile) ---> Internet
For networking the bq supports tethering via an USB device (run the following in the terminal app):
$ android-gadget-service enable rndis
I do this after every boot from within the terminal app with a small script ~/rndis.sh:
#!/bin/sh
android-gadget-service enable rndis
The launch of the script is bound to a special key to make this easy.
This will switch the USB port from MTP to tethering and create a 'rndis0' network device whith the IP addr 10.42.0.1; The Ubuntu offers to the connected computer an IP via DHCP (somehow it takes sometime).
After this SSH is fine too as:
$ ssh [email protected]
Welcome to Ubuntu Utopic Unicorn (development branch) (GNU/Linux 3.4.67 armv7l) > 
...
$ netstat -rn
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
0.0.0.0         192.168.2.1     0.0.0.0         UG        0 0          0 wlan0
10.42.0.0       0.0.0.0         255.255.255.0   U         0 0          0 rndis0
172.28.23.131   0.0.0.0         255.255.255.255 UH        0 0          0 ccmni0
192.168.2.0     0.0.0.0         255.255.255.0   U         0 0          0 wlan0
How can I set it as default to rndis enabled?
Oliver Grawert:
you cant, it is hardcoded on boot to always have working mtp (until
here is a UI option to turn it on or off, we want regular users to
lways be able to exchange files), but you can override it in a user
pstart job that runs at a later point ...
​
Create /home/phablet/.config/upstart/rndis.conf with the following
content:
​
--------------- snip ------------------
start on started indicator-network
​
task
​
script
    android-gadget-service enable rndis
end script
​
--------------- snap ----------------
​
When the interface rndis0 is enabled, somehow HTTPS access to
the Ubuntu's app store is no longer possible; investigationg ...
Last updated: Sun Oct 18 09:23:23 CEST 2015
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