Renzo il 18:20, 11 feb 2016

2016-02-11T18:20:18Z

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2016-02-11T18:11:56Z

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Chip can create a TCP-IP networking connection on USB. (it creates a virtual ethernet on USB, RNDIS protocol).

When Chip is connected to a host computer by a USB cable (USB-A to the host, USB micro to chip) it normally provides a serial emulation on USB.
(Chip is powered from the host, too).

Edit /etc/modules:
<pre>
#
# This file contains the names of kernel modules that should be loaded
# at boot time, one per line. Lines beginning with "#" are ignored.
#g_serial
g_ether
</pre>

Add an IP address to the usbnet interface (10.1.1.2 is just an example):
<pre>
sudo nmcli con add type ethernet con-name usbnet ifname usb0 ip4 10.1.1.2/24 gw4 10.1.1.1
sudo nmcli con mod usbnet ipv4.dns "8.8.8.8 8.8.4.4"
sudo nmcli con up usbnet
</pre>

Reboot chip.
<pre>
sudo reboot
</pre>

If everything is okay, after the boot on the host there will be a new network interface.
On my debian laptop the new interface appears like this:
<pre>
# ip addr
....
27: enx2a661f404b74: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether 2a:66:1f:40:4b:74 brd ff:ff:ff:ff:ff:ff
</pre>

Now on the host add a suitable address to the new interface:
<pre>
# ip addr add 10.1.1.1/24 dev enx2a661f404b74
# ip link set enx2a661f404b74 up
</pre>

Chip is now "online" using the virtual ethernet on the USB.
<pre>
# ping 10.1.1.2
PING 10.1.1.2 (10.1.1.2) 56(84) bytes of data.
64 bytes from 10.1.1.2: icmp_seq=1 ttl=64 time=0.245 ms
64 bytes from 10.1.1.2: icmp_seq=2 ttl=64 time=0.172 ms
...
</pre>

Now you can use ssh to reach your chip computer.
<pre>
$ ssh chip@10.1.1.2
chip@10.1.1.2's password:

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Thu Feb 11 13:51:27 2016 from 10.1.1.1
chip@chip:~$
</pre>

It is convenient to set up NAT and forwarding on the host.
<pre>
# modprobe iptable_nat
# echo "1" > /proc/sys/net/ipv4/ip_forward
</pre>
(if the host is connected through eth0)
# iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
(if the host is connected through wlan0)
# iptables -t nat -A POSTROUTING -o wlan0 -j MASQUERADE

In this way chip is connected to the world using a wired connection.

When you want switch back to the "terminal emulation mode" on the USB it is sufficient to swap the comments in the file /etc/modules:
<pre>
# /etc/modules: kernel modules to load at boot time.
#
# This file contains the names of kernel modules that should be loaded
# at boot time, one per line. Lines beginning with "#" are ignored.
#g_serial
g_ether
</pre>

Nota Bene: If something goes wrong (the networking connection does not work properly) you have two ways to have a shell access to edit /etc/modules:
* plug a monitor and a keyboard
* use a USB uart cable (e.g. Adafruit's [https://www.adafruit.com/products/954 console cable])

← Versione meno recente		Versione delle 18:20, 11 feb 2016
Riga 1:		Riga 1:
	Chip can create a TCP-IP networking connection on USB. (it creates a virtual ethernet on USB, RNDIS protocol).		Chip can create a TCP-IP networking connection on USB. (it creates a virtual ethernet on USB, RNDIS protocol).
		+	If you run ChipOS (i.e. the pre-installed OS on the v.1 Chip) you do not need to re-compile your kernel or doing hard hacking.
		+	It needs just some configuration commands.

	When Chip is connected to a host computer by a USB cable (USB-A to the host, USB micro to chip) it normally provides a serial emulation on USB.		When Chip is connected to a host computer by a USB cable (USB-A to the host, USB micro to chip) it normally provides a serial emulation on USB.

Chip: USB On The Go Ethernet Connection - Cronologia

Renzo il 18:20, 11 feb 2016

Renzo: Creata pagina con 'Chip can create a TCP-IP networking connection on USB. (it creates a virtual ethernet on USB, RNDIS protocol). When Chip is connected to a host computer by a USB cable (USB-A...'