Incorrect message format produced by Asv.Mavlink

Dear all,
I am using Asv.Mavlink C#/.NET library on my backend in order to send MAVLINK messages in udp form to my mobile phone. My mobile phone runs Rosettadrone Android app. When I try to debug Rosettadrone mobile side I see that it does not “understand” messages in format produced by Asv.Mavlink. For example, it cannot parse Heartbeat message.
Is there anybody who had similar problem?
Any help is highly appreciated.
Thank you for your support