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Property, plant and equipment, net (Details) - USD ($)
Sep. 30, 2021
Sep. 30, 2020
Property, Plant and Equipment [Line Items]    
Subtotal $ 145,949 $ 80,512
Accumulated depreciation (66,467) (41,643)
Total 79,482 38,869
Plant, machinery and equipment    
Property, Plant and Equipment [Line Items]    
Subtotal 70,113 12,351
Transportation equipment.    
Property, Plant and Equipment [Line Items]    
Subtotal 54,362 51,450
Office equipment    
Property, Plant and Equipment [Line Items]    
Subtotal $ 21,474 $ 16,711