Yes this is the conclusion I have come too. I believe Energia' implementation of the Watchdog here is what causes the higher usage. It is very impressive that it manages to get even close. I think it is abit misleading to call SleepSeconds() true LPM3 though.
It would be great to see some other implementation though; as the MSP430 is capable of sub 1ua sleep.
Perhaps I will experiment with a library in the future to make this possible.
Thanks for your response.
"support has been added in Energia for the MSP430FR5994" but Serial1 is not working, and and even more unfortunate, the available I / O still does not support interrupt handling.
I mentioned these problems since May 2018, Energia1.8.7E20 is available and the same problems are still unresolved.
It is difficult to try to work with a chip that is very poorly supported by the ENERGIA teams.
Sorry for this reminder, but please try to do something!
I develloped a simple Lora gateway (Wifi+GSM/GPRS) from this launchpad and the results are good despite these difficulties of programming!!