Can I synthesize arbitrary text strings with TTS from the Android's console?
To give the idea, on Debian I would do:
festival --tts <(echo Buongiorno signore)
The TTS engine needs to be always available and run offline, thus Google TTS is not an option. The phone is a "Samsung Galaxy Fame gt-s6810p" with Android 4.1.2; it comes with an offline Samsung TTS engine installed.