HcAppCast constructor
      
      HcAppCast({ 
    
    
- Client? client,
 - HcUpgradeOS? hcUpgradeOS,
 - HcUpgradeDevice? hcUpgradeDevice,
 
Implementation
HcAppCast({
  http.Client? client,
  HcUpgradeOS? hcUpgradeOS,
  HcUpgradeDevice? hcUpgradeDevice,
})  : client = client ?? http.Client(),
      hcUpgradeOS = hcUpgradeOS ?? HcUpgradeOS(),
      hcUpgradeDevice = hcUpgradeDevice ?? HcUpgradeDevice();