Cohda MK5 Onboard Unit – Functional Test

Items Needed

MK5 OBU Unit.
12V DC Adapter.
Lab Mobile DSRC antenna.
Test PC.
Ethernet Cable.

Basic Setup

Using the tablet or an external computer, connect to the CradlePoint router using the WiFi SSID Info document.
If your mobile kit does not have a router, you may connect to the OBU via Ethernet. Otherwise, continue to step 7.
1. Check your IP Address by opening Network and Sharing Center in Windows.
2. Within that window, click on Ethernet.
3. Refer to figure 27.

This screenshot shows the Network and Sharing Center in Windows. An arrow points to 'Connections: Ethernet.'

Source: FHWA.
Figure 27. Screenshot. Network and Sharing Center.

A new window will open. In that window, click on Properties. Refer to figure 28.

This screenshot shows the Ethernet status in Windows. An arrow points to the properties button at the bottom left-hand corner.

Source: FHWA.
Figure 28. Screenshot. Ethernet status.

Within the Ethernet Properties window, double-click/open Internet Protocol Version 4 (TCP/IPv4).
1. Refer to figure 29.

This screenshot shows the Ethernet properties in Windows. A list of items is on the screen with the title, 'This connection uses the following items:' The Internet Protocol Version 4 (TCP/IPv4) item in the list is highlighted.

Source: FHWA.
Figure 29. Screenshot. Ethernet properties.

Ensure that Use the following IP address is selected. Input the same configurations as figure 30.

Source: FHWA.
Figure 30. Screenshot. IPv4 settings.

Click OK at the bottom of the window, then close all previous Windows.
Open a Terminal/Command Prompt.
1. If using a tablet, you may not have access to a terminal. Skip to Step 9.
Attempt to ping each device within the Mobile Kit. Refer to figures 31 and 32.
1. ping 192.168.0.50
2. To stop ping process: <Ctrl>C.

This diagram illustrates the mobile kit network configuration.

Source: FHWA.
Figure 31. Diagram. Mobile kit network configuration.

This screenshot shows an example of a positive ping output.

Source: FHWA.
Figure 32. Screenshot. Example positive ping output.

Using the acceptance checklist, mark off the box indicating correct IP/Port combinations.
If using a tablet, open PuTTY. Copy the settings in figure 33 and click on Open.
1. Use the password in step 11 to login to the OBU.

This screenshot shows the PuTTY configuration. The Host Name (or IP address) is 192.168.0.42 and the port is 22. The connection type is SSH. The 'Close window on exit' option is set to 'Only on clean exit.'

Source: FHWA.
Figure 33. Screenshot. PuTTY settings.

To connect to OBU use:
1. ssh user@192.168.0.50
2. If prompted to continue connecting, enter: yes
3. Password: user
4. Refer to figure 34 for an example login output.

This screenshot demonstrates an example of login output of an onboard unit (OBU).

Source: FHWA.
Figure 34. Screenshot. OBU login example.

Testing GNSS Operation

Connect the antenna to the OBU.
1. Make sure the GPS is connected to the blue fakra connection labeled as GNSS in figure 35. The Lab Mobile DSRC antenna GPS connector is also blue.
2. The other two can be connected in any order to Ant 1 and Ant 2.

This photo shows an MK5 onboard unit (OBU). The left connection on the bottom of the OBU is labeled GNSS, the middle one is labeled Ant 1 5.9 GHz, and the right one is labeled Ant 2 5.9 GHz.

Source: FHWA.
Figure 35. Photo. MK5 OBU hardware setup.

To send BSMs, GPS must first be established.
1. To check for proper GPS signal, use:
  1. date
  2. The output will be the current date. Refer to figure 36 for example output.
  3. If date is not correct, move antenna to an area with better reception.

This screenshot shows an example of the GPS date output.

Source: FHWA.
Figure 36. Screenshot. GPS date output.

Testing BSM Transmission

To check for BSM transmissions, enter:
1. ifconfig
2. A list of network interfaces will appear. If you do not see “cw-mon-txb”:
  1. cd /opt/cohda/application/example1609
  2. ./rc.example1609 start obu
  3. Repeat step 1a
  4. If process does not begin, a GPS signal is not available
3. Otherwise, continue to step 2
A further check after cw-mon-txb is available:
1. tcpdump –i cw-mon-txb –xx
2. The BSM message ID is 14 in Hexadecimal. The ID can be seen below
3. A search for the ID can be run by adding:
  1. | grep “00 *14”
4. Refer to figure 37 for output.

This screenshot shows an example of the output of basic safety message transmission.

Source: FHWA.
Figure 37. Screenshot. BSM transmitting output.

Testing DSRC Message Receiving

The interface for receiving messages is cw-mon-rxb. Check messages received:
1. tcpdump -i cw-mon-rxb –xx
2. The MAP message ID is 12 in Hexadecimal.
  1. A search for the ID can be run by adding either:
    1. | grep “00 *12”
3. The SPAT message ID is 13.
  1. A search for the ID can be run by adding either:
    1. | grep “00 *13”
4. Outputs will be similar to figure 37.

Changing Radio Settings

The radio settings may be changed in the obu.conf file. This file is located in the /mnt/rw/example1609/ directory. Before changes are made, rc.example1609 must be stopped.

Stop example1609:
1. /opt/cohda/application/example1609/rc.example1609 stop
Open the obu.conf file:
1. cd /mnt/rw/example1609/
2. vi obu.conf
Make changes to the file:
1. Type i to insert characters.
2. To cancel inserting, hit <Esc>.
3. To exit file without saving:
  1. :q!
4. To write and exit:
  1. :wq

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