The value should be treated as a simple arbitrary number.
Typical messaging flow:
1. User queue message to be sent, with an expiry time of 7200 seconds (2 hours):
$TD HD=7200,“Hello there!”*04
2. Device acknowledges receipt of message, and message enters into device’s internal
message database. Message is given the message ID of
5354468575855
. Database has a
maximum amount of 2048 messages stored. Database is non-volatile and messages persist
through sleep mode and power cycling:
$TD OK,5354468575855*2a
3. If the message has not expired due to time (as it was set to expire 2 hours from when it was
entered), when the device hears a satellite pass overhead it attempts to send any messages in
its database. Messages are scheduled to be sent in the order they were entered into the device
(e.g. first in database, first transmitted). Each message heard by the satellite is individually
acknowledged with a
$TD SENT
response - the acknowledged message is referred to by its
message ID (
5354468575855
)
$TD SENT,RSSI=-99,SNR=5,FDEV=32,5354468575855*6f
4. Acknowledged message in database is marked for deletion by device. Any unsent messages
will be attempted to be sent by the device at a later time.
October 2020
Swarm Tile Manual - Rev 1.10
64/65
