According to the Power Management page https://github.com/synthetos/TinyG/wiki/Power-Management, $me=N should energize the motors for N seconds. For me, it does nothing (no-op). It also says that for JSON mode that {me:60} should also enable the motors for 60 seconds. In that case it also does nothing along with {"me":60}. But, issuing {"me":"60"} enables the motors for the default motor timeout value (mt).
Is it me or is this a bug?
I am running 438.02 build 0.97