Fix Wireshark dissector and add snapshot tests

.github/workflows/test.yml

@@ -31,7 +31,7 @@ jobs:
           fi
           if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
           sudo apt update
-          sudo apt install -y libgtest-dev g++
+          sudo apt install -y libgtest-dev g++ tshark
 
       - uses: actions/setup-node@v3
         with:

examples/README.md

@@ -8,7 +8,6 @@
 | apmsetrate.py   |  Set the Stream Rate on an APM. |
 | magtest.py      |  Rotate APMs on bench to test magnetometers.  |
 | mavtcpsniff.py  |  Connect as a client to two tcpip ports on localhost with mavlink packets. Pass them both directions, and show packets in human-readable format on-screen.  |
-| mav2pcap.py     |  Packetizes a binary MAVLink stream. The resulting packets are stored into a PCAP file, which is compatible to tools like Wireshark.  |
 | wptogpx.py      |  Extract GPS data from a waypoint file, and create a GPX file, for loading into Google Earth.  |
 | mavgps.py       |  Allows connection of the uBlox u-Center software to a uBlox GPS device connected to a PX4 or Pixhawk device, using Mavlink's SERIAL_CONTROL support to route serial traffic to/from the GPS, and exposing the data to u-Center via a local TCP connection.  |
 | mavtester.py    |  Test mavlink messages.