get Record Size
Returns Single that emits record size of specified type of file.
NOTE:
Wristband must be connected.
User must be valid.
Return
Single that emits record size of specified type of file
Parameters
file No
file number
Returns Single that emits record size of specified type of file.
NOTE:
Wristband must be connected.
User must be valid.
Single that emits record size of specified type of file
file number