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I would guess that your ARM machine is configured to run big-endian. The ROS communication protocol uses little-endian on the wire and as far as I know, roscpp's seralizer doesn't account for running on a big-endian host.

Adding big-endian support to roscpp has been discussed.

But you can likely work around your problem by configuring your ARM machine to run as little-endian instead of big-endian. There's usually a way to do that.

Btw, I would expect rospy to work properly across mixed-endian machines as it's using Python's struct module to implement serialization.