Decompress it and create a new Overo SD card with the following command, replacing
sdx
with the location of your SD
card within the
/dev/
folder:
$
dd if=overo-conduit-yocto.img of=/dev/sdx bs=4M
3.3
Packet Forwarder
The disk image provided above includes the TTN packet forwarder in
root
’s home folder so there is no need to build
it.
If you would like to build it from scratch, follow the directions for compiling the TTN packet forwarder located at
https://github.com/TheThingsNetwork/packet_forwarder
and copy the program to
/media/rootfs/home/root
.
To set your gateway up on
thethingsnetwork.org
, create a YAML file called
pkt-fwd.yml
in the same directory with
2 fields:
•
id
: This is the name given to your gateway in the TTN console
•
key
: This is the key, starting with
ttn-account-
, that is provided in the TTN console
The application is written for the Raspberry Pi
r
and a script is therefore required to adapt it to the Overo system. Create
a file called
start-packet-forwarder.sh
and paste in the following script:
#!/bin/sh
# Toggle reset GPIO
echo "21" > /sys/class/gpio/export
echo "out" > /sys/class/gpio/gpio21/direction
echo "0" > /sys/class/gpio/gpio21/value
sleep 1
echo "1" > /sys/class/gpio/gpio21/value
sleep 1
echo "0" > /sys/class/gpio/gpio21/value
# Create symlink to spidev1@0
if [ -c "/dev/spidev0.0" ]
then
echo "spidev0.0 already exists"
else
ln -s /dev/spidev1.0 /dev/spidev0.0
fi
# start the packet-forwarder
./packet-forwarder –config pkt-fwd.yml –ignore-crc
Copy the script into
\home\root\
on the SD card, insert it into the slot on the Overo COM and plug in the device. SSH
into it and run the script. The gateway should now be sending and receiving packets from the TTN API.
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