JSON message about terminal upgrade progress
{ " batchUpgradeProgress": { "UpgradeTerminalList": [ { "UpgradeTerminal": { "terminalNo": , /*optional, int, terminal No.*/ "currentStatus": "", /*required, string, current upgrade status: upgrading, failed, upgraded*/ "percent": , /*optional, int, upgrade progress, range: [0,100], this filed is valid only when currentStatus is "upgrading"*/ "failedReason": "" /*optional, string, upgrade failure reason, this filed is valid only when currentStatus is "failed"*/ } } ] } }