The best we can do is give an example. This is what we used in our gateway application included with our LC3020 "system on a chip" SDK. This chip contains an ARM7 microprocessor and uses the RTEMS OS ( http://www.rtems.com/ ) (All numbers mentioned below do not include the size of the operating system)

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243Kb . TOTAL

If it is desirable to reduce this footprint even more, we have a in-house version of BACstac called "BACstac/IPC" which allows one to remove BACstac services and reduce size/functionality as needed. The footprint of this BACstac core is 71 Kb.