The contents of a TextMessage containing data to give to a IOX Add-On over an RS232. It holds more data than SerialIoxContent and is not compatible with all Add-Ons. For more information regarding Add-On compatible please contact your reseller. MimeContent is converted into bytes with a specific format. The first byte is the length of the MimeType (N). The next N bytes are the ASCII encoded bytes of the MimeType string. The next two bytes are the length of the Data (L). Finally, the next L bytes are the Data. Messages from MyGeotab will be delivered in this format and messages to MyGeotab must be in this format as well.