CubeCell-Arduino
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BoardGetRandomSeed not implemented
Poking a bit in the source code, it appears there should be BoardGetRandomSeed() and HW_GetRandomSeed(). But both are not implemented (produce a linker error).
Indeed the seed is system ticker, The system ticker of ASR650X is not accurate, so it can be used as the random seed.
This topic may make sense to you: http://community.heltec.cn/t/cubecell-micros-function/985/3?u=supporter