Hi John. Here is the code that I wrote for the matlab-mavlink interface. It's not very efficient and doesn't work very well, maybe you will have better luck. Currently the way that it works is that it reads the mavlink xml file for the apm, automatically creates a parsing file and then a sample mavlink file i generated using qgroundcontrol is run through it. The main problem is that the datatypes/field lengths are not implemented correctly. My suggestion would be to find a better way of doing this than to try to fix this software. But good luck.