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# 6LowPAN with the Merkur-Board
In for the [[rpi6lowpan]] to be actually usefull it needs to talk to
some sensors. The [Merkur Board][0] is open hardware:
[[!img merkur-board.jpg size="x150" alt="Merkur-Board"]]
It has digital outputs as well as digital, analog and PWM outputs and
supports attaching Arduino Grove Modules which should make experiments
simple. In order to test things I use the
[Plant Oberservation Kit][1] set.
One uses USB-Serial converter to flash the device. Details on how to
connect it are [here][2]. Once the converter is attached to the board
it's LED starts to blink (in my case 4 times short, one time long).
Once flushed the board can be run on [battery power][3].
* [Details on the different pinouts][4]
* [Details on how to flash the device][5] with avrdude
* The plant moisture sensor connects to [A5][6]
* [Find A5][] on the Grove Board
Compiling works like
apt-get install avr-libc binutils-avr gcc-avr gdb-avr simulavr avrdude doxygen
git clone https://github.com/osdomotics/osd-contiki
cd ./osd-contiki/examples/osd/arduino-plantobserving
./run.sh
The build software can then be flushed to the device. Note that it uses
/dev/ttyUSB0 by default. This needs to be adjusted. When trying the flash the
merkur-board with the usual USB-serial converter I see:
$ sudo apt-get install avrdude
$ cd osd-contiki/examples/osd/arduino-plantobserving
$ ./flash.sh /dev/ttyUSB4
INFO: compiling with CoAP-13
avrdude -pm128rfa1 -c arduino -P/dev/ttyUSB4 -b57600 -e -U \
flash:w:arduino-example.osd-merkur.hex:a -U \
eeprom:w:arduino-example.osd-merkur.eep:a
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x72
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x6c
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0xc0
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x72
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x6c
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0xc0
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x72
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x6c
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x72
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x6c
avrdude done. Thank you.
Makefile:88: recipe for target 'flash' failed
make: *** [flash] Error 1
even if I [ground the reset pin][7] (Pin 3). However if I use a [*FTDI basic
breakout*][8] flashing works as expected:
....
The flashed firmware uses *channel 26* and *pan_id 0xabcd* by default. This can
be seen on the serial output (you can use the same serial converter as for
flashing). To read the serial console I've so far used the serial console
window from the arduino ide since *screen* doesn't support the 38400 baud used
by the merkur-board ().
While I'm seeing packages looking for a RIPL router send by the merkur-board
when using a Raspberry Pi as described in [[here|rpi6lowpan]], I can't ping the
board on it's link local address yet.
So let's for now use a second merkur board as [edge-router][].
$ sudo ./tunslip6 -s /dev/ttyUSB4 -B 38400 2001:DB8:c001:f00d::1/64
$ ping6 -c 1 2001:db8:c001:f00d:221:2eff:ff00:347c
PING 2001:db8:c001:f00d:221:2eff:ff00:347c(2001:db8:c001:f00d:221:2eff:ff00:347c) from 2001:db8:c001:f00d::1 tun0: 56 data bytes
64 bytes from 2001:db8:c001:f00d:221:2eff:ff00:347c: icmp_seq=1 ttl=63 time=201 ms
--- 2001:db8:c001:f00d:221:2eff:ff00:347c ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 201.620/201.620/201.620/0.000 ms
$ ./coap-client -m get coap://[2001:db8:c001:f00d:221:2eff:ff00:347c]/.well-known/core
v:1 t:CON c:GET i:8ecd {} [ ]
</.well-known/core>;ct=40,</moisture/v>;title="Moisture voltage"v:1 t:CON c:GET i:8ece {} [ ]
;rt=UCUM:"V";ct="0 5"
We can now query the moisture sensor using [libcoap]:
$ ./coap-client -m get coap://[2001:db8:c001:f00d:221:2eff:ff00:347c]/moisture/v
## Some Linux, Contiki interop progress
Looking into the above problem in some more detail it shows that using
[[rpi6lowpan]] setup in [monitor mode][] we see all the packages sent
from the merkur boards on Linux but not vice verca. If we
[disable sleep mode][] in contiki we can receive frames from Linux
when pinging the merkur-board from the Raspberry Pi:
Received NS from fe80::80cd:9a1:845b:4d6a to ff02::1:ff00:3304 with target addressfe80::221:2e��f:ff0N��
Sending NA to fe80::80cd:9a1:845b:4d6a from fe80::221:2eff:ff00:3304 with target address fe80::221:2eff:ff00:3304
sicslowpan output: sending packet len 80
before compression (40): 6000000000283aff
...
...but the Linux node doesn't see the replies. More to come when we have a second pi that can act as monitor.
[0]: http://osdwiki.open-entry.com/doku.php/de:projekte:merkur
[1]: http://osdwiki.open-entry.com/doku.php/de:projekte:plant_observation_kit
[2]: http://osdwiki.open-entry.com/doku.php/de:tutorials:first_steps_arduino_ide
[3]: http://osdwiki.open-entry.com/lib/exe/detail.php/de:ideen:merkurknoten.jpg?id=de%3Aideen%3Afirststepsmerkurboard
[4]: http://osdwiki.open-entry.com/doku.php/de:projekte:merkur#pinouts
[5]: http://osdwiki.open-entry.com/doku.php/en:projekte:bootloader?s[]=flash
[6]: http://osdwiki.open-entry.com/doku.php/de:products:merkur_grove_board_4#steckerbelegung
[7]: http://www.meetup.com/IoT-Vienna/events/181968432/
[Prolific Pinout]: https://jethomson.files.wordpress.com/2010/02/ca-42_dku-5_pinout.jpg
[8]: http://www.open-entry.com/coxcoon/de/Zubehoer/FTDI-Basic-Breakout-3-3V.html
[edge-router]: http://osdwiki.open-entry.com/doku.php/de:tutorials:contiki:merkur_board_rpl_usb_router
[Find A5]: http://osdwiki.open-entry.com/doku.php/de:products:merkur_grove_board_4
[libcoap]: http://sourceforge.net/projects/libcoap/
[monitor mode]: http://wpan.cakelab.org/#_sniffing
[disable sleep mode]: https://github.com/agx/osd-contiki/commit/5ecf780a4873b6942e50964cfcb3d067b0a60cce
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