Citizen CL-S700 Programming Manual page 88

--- Example, get from a property ---
2016/03/10 17:14:25.474 001 PROPERTY set printDarkness <- 10 : Success(0)
* The logging function could be a "bottleneck" of processing since it tries to keep the information of
every single execution of a method or access to a property.
* Logging could fail without a notification for the reason below.
- A write-protected device is selected as a storage location.
- No enough space in the selected storage device.
- The storage location contains a file with write-protection.
- No access privilege to a file or folder.
- Another program is using the log file.
CITIZEN Android Label Print SDK — Programming Manual
88