Good day. Thank you for your question.
Yes, it is possible to change the sleep mode by SMS on FMB110. Kindly refer to the following link on the parameter ID:
The SMS structure will be as follows:
With login and password : <login><space><password><space>setparam 102:4
Without login and password : <space><space>setparam 102:4
where 102 is the parameter ID for sleep mode and 4 is value for ultra sleep mode.
For the values of other sleep modes, please refer here - https://wiki.teltonika-gps.com/view/FMB110_Parameter_list
If you are sending via GPRS then you may skip the login, password, and <space>.
For other SMS/GPRS command list please refer here - https://wiki.teltonika-gps.com/view/FMB_SMS/GPRS_Commands
Kindly go through this and let me know if it helps.