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String | Command = "" |
| Mgmt command sent to printer or response from printer.
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String | Content = "" |
| This is the command-dependent content/data. Callers are responsible for creating/parsing the proper JSON format.
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String | From = "" |
| Identifies the message sender. If the printer sends a response, this will be in the To field of the response.
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String | To = "" |
| Identifies the intended message receiver. If this is a response, this has the From that was in the original message.
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String | TrackNo = "" |
| This can be set to any value, but to differentiate messages intended for the same recipient, this should be unique for every message.
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