XMPPConnection and PacketReader are parts of the Smack XMPP library. If you're the curious type, you can adb into your phone and do a `ps` to correlate the PID that's generating these messages (772 here) with an apk. Then you can dump that apk and disassemble/decompile it (i.e. using apktool, dex2jar, and your favorite Java decompiler).