For testing my Smart Village I need random generation of temperature, humidity, pressure, smoke etc., so, using  my knowlege, based on Micropython book by Rui, I wrote random generation module using os.urandom() module

def rand( floor, mod=0, negative = False):
    # return random value from -floor.mod to floor.nod if negative is True

    from os import urandom as rnd

    sign = 1 if ord(rnd(1))%10 > 5 else -1
    sign = sign if negative else 1

    if mod:
        value = float(('{}.{}').format(ord(rnd(1))%floor, ord(rnd(1))%mod))
    else:
        value = int(('{}').format(ord(rnd(1))%floor))

    return sign*value

For example, if I need random temperature in range -39.9 to 39.9:

for _ in range(10):
    print(rand(40,10,True))

or True/False sequence

for _ in range(10):
    print(rand(2))

Worked fine both on ESP32 and ESP8266