User's Manual

Messages have three states: unread, read, and deleted. Once an unread message is read, its
state changes to read. It can subsequently be read again. If a message is deleted, it can no
longer be read. All in the above context means both read and unread messages, but does not
include messages that have been deleted.
If a message is marked read using the M=<msg_id> or M=* command, marking it as read again
is not an error.
(1) <msg_count> is a number indicating the number of messages that are unread in response
to the C=U command, total number of read and unread messages in response to the C=*
command, and the number of messages deleted in response to the D=* command.
(2) <data> is in the same format as an unsolicited $RD message. <msg_id> is the message
ID. The message ID should be treated as a simple arbitrary number. <es> is the epoch seconds
time when the message was received by the Tracker.
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