GL100 @Track Air Interface Protocol
3.5.
Synchronization ACK message
If the
AT+GTACK
command has enabled the mechanism SYNC-ACK for a specified uplink
message, the backend server should respond with the synchronization ACK (SYNC-ACK)
message to the terminal after it has received the specified uplink message.
The terminal will wait for the SYNC-ACK message before closing the connection, and will resend
the uplink message if it has not received the SYNC-ACK message for a period of time since the
uplink message had been sent out.
Please refer to the following introduction for the details about timeout and resending:
The maximum times to resend is 5 before the corresponding SYNC-ACK message is received
from the backend server and the interval between sending and the first instance of resending is 10s.
Then the interval between each resending is 20s, 30s, 40s and 50s in turn. After 60 seconds expires
from the last instance of resending, the terminal will close the connection and will not resend the
uplink message any more.
Please refer to the following table for the detailed format of a SYNC-ACK message.
¾
+SRVACK:
Example:
+SRVACK:11F0
Parameter
Length(byte)
Range/format
Default
count num
4
<
count num
>: An integer in HEX format which equals the <
count num
> in the uplink
message.
TRACGL100AN002
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