Simple, it wanted a int32. It turns out the reply will spit out 'no such method' for invalid argument types. I can now read and set the title.

Code: Select all

$ dbus-send --session --dest=$KONSOLE_DBUS_SERVICE --type=method_call --print-reply /Sessions/35 org.kde.konsole.Session.title int32:1
method return sender=:1.88 -> dest=:1.183 reply_serial=2
   string "Shell %#"

dbus-send --session --dest=$KONSOLE_DBUS_SERVICE --type=method_call --print-reply /Sessions/35 org.kde.konsole.Session.setTitle int32:1 string:"mytitle"
method return sender=:1.88 -> dest=:1.187 reply_serial=2