Change megastek frame decoder (fix #895)
Change megastek frame decoder (fix #895)

stalien/traccar_test,tananaev/traccar,ninioe/traccar,al3x1s/traccar,jon-stumpf/traccar,duke2906/traccar,stalien/traccar_test,renaudallard/traccar,5of9/traccar,AnshulJain1985/Roadcast-Tracker,vipien/traccar,orcoliver/traccar,ninioe/traccar,tananaev/traccar,duke2906/traccar,jssenyange/traccar,jssenyange/traccar,orcoliver/traccar,joseant/traccar-1,tsmgeek/traccar,jssenyange/traccar,jon-stumpf/traccar,renaudallard/traccar,tsmgeek/traccar,joseant/traccar-1,al3x1s/traccar,ninioe/traccar,orcoliver/traccar,vipien/traccar,5of9/traccar,jon-stumpf/traccar,tsmgeek/traccar,AnshulJain1985/Roadcast-Tracker,tananaev/traccar