this are so stupid, so many bugs that god knows.
Lately we have spent 2 days(!!!) just to discover that on AT version v0.2 , after you upload the bin, and everything works great under baud 115, then you try to set to the new baud rate 9600. also everything works great. but then , then, you reset the chip, and boom !! no serial anymore !!
We have manage to repeat this process 3 times to be sure.
moreover, if you try to flash the chip with a new bin, its a hell. a real hell. too many files, AT version, SDK version, bin files, address, wow !!!!
Some Russian website have this one bin file that worked, but god , its a nightmare !
Well, our company depend on this crapy chip, but i can say to anyone who is even considering this, dont go there !!!!
Endless hours on such things, i had never ever thought i would spend months of my life because of some stupid company!!