20. Cost of sales (Details) - USD ($)	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cost of sales	$ 245,808	$ 261,498
Material Purchases [Member]
Cost of sales	5,907
Service [Member]
Cost of sales	1,436
Other [Member]
Cost of sales	12,003
Monitoring [Member]
Cost of sales	204,891
Shipping and Handling [Member]
Cost of sales	$ 21,570