Development Suggestions - Intermec 680X Reference Manual

781T Printer using Wireless Printing
The average time needed to connect to the printer is about
three seconds. There are times when it can take up to seven
seconds. Keep in mind, that if a connection fails, you could
attempt a retry.

Development Suggestions

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*Bluetooth is a trademark of Bluetooth SIG, Inc., U.S.A.
3-8 Intermec Portable Printers Technical Reference Manual
Connection Retries--Just like cell phones and garage
door openers, Bluetooth is a radio frequency technolo-
gy. Because of that, there will be times when a connec-
tion attempt will fail. This failure can occur for many
reasons (out of range, interference, etc.). To cope with
this, applications should build in a retry mechanism.
Our testing shows that three retries is the optimum
number to code into your program. The majority of the
time, the first retry will succeed if the previous con-
nection failed due to interference or timing windows.
If a connection fails on a 3rd retry, there is most likely
a condition preventing the connection would should be
investigated further.
Persistent storage of printer address. Some customers
will choose to use equipment that is "tied" together. In
this scenario a particular mobile computer will always
be used with the same printer. If you choose to use
this scenario, you can store the printer 's Device Ad-
dress to the mobile computer's storage card. That way,
if you need to cold boot the unit for an application up-
grade, the mobile computer can associate itself with
the printer automatically without going through the
Device Discovery process.
SECTION 3