docs: def main():
      '''main routine'''
      # Load Azure app defaults
      try:
          with open('azurermconfig.json') as config_file:
              config_data = json.load(config_file)
      except FileNotFoundError:
          sys.exit('Error: Expecting azurermconfig.json in current folder')
  
      tenant_id = config_data['tenantId']
      app_id = config_data['appId']
      app_secret = config_data['appSecret']
      subscription_id = config_data['subscriptionId']
  
      access_token = azurerm.get_access_token(tenant_id, app_id, app_secret)
  
      vmsslist = azurerm.list_vmss_sub(access_token, subscription_id)
      for vmss in vmsslist['value']:
          name = vmss['name']
          location = vmss['location']
          capacity = vmss['sku']['capacity']
          print(''.join(['Name: ', name, ', location: ',
                         location, ', Capacity: ', str(capacity)]))
          print('VMSS NICs...')
          rgname = get_rg_from_id(vmss['id'])
          vmss_nics = azurerm.get_vmss_nics(
              access_token, subscription_id, rgname, name)
          print(json.dumps(vmss_nics, sort_keys=False,
                           indent=2, separators=(',', ': ')))
          print('VMSS Virtual machines...')
          vms = azurerm.list_vmss_vms(
              access_token, subscription_id, rgname, name)
          #print(json.dumps(vms, sort_keys=False, indent=2, separators=(',', ': ')))
          for vmssvm in vms['value']:
              vm_id = vmssvm['instanceId']
              print(vm_id + ', ' + vmssvm['name'] + '\n')
              print('VMSS VM NICs...')
              vmnics = azurerm.get_vmss_vm_nics(access_token, subscription_id, rgname, name,
                                                vm_id)
              print(json.dumps(vmnics, sort_keys=False,
                               indent=2, separators=(',', ': ')))