Coffee app is awesome for Android Wear but it's limited to SMS only and not MMS due to Android's limitation on notification access to MMS. it's not a SMS client but rather a notification handler that allows new messages to be sent and/or canned responses. There are two options here, one being easier than the other. 1) add setting for Textra to only notify on AW (Android Wear) when a MMS is received but not SMS. Then coffee can handle the SMS notifications. 2) integrate Coffee into Textra or Coffee like features.