I had a similar problem until I used the latest testflight version of the iOS app (3.0.7). Hope it helps.
Here is the parameters for sendNotification I used to notify that my printer is still on:
sendNotification("xxx.xxx@xxx.fr", "L'imprimante est restée allumée", "hp1212", null, "Alerte", null, "ui:/basicui/app?w=1104&sitemap=uicomponents_mamaison", null, null, null, null)