What is the expected code size for a full featured GG Stack? about golden-gate

[barbibulle]

The runtime code size depends somewhat on what features you use, but here's what I can see for a typical use case: compiling the sample app for MyNewt (running on an ARM Cortex M-4) with DTLS and CoAP, looking at just the stack runtime (i.e not the test CoAP services used as a demo, like the Hello World resource or the internal blast test service), I get (code size):

• cross-platform lib: 43,710 bytes
• mbedtls: 44,206 bytes
• LWIP: 4,966

Total: 92,882 bytes

To this you need to add the code that interfaces with Bluetooth, which is very platform-dependent. On MyNewt with the Nimble stack, I think that's about 3-4kB.

The mbedtls library is of course about 50% of the code size here, so if you want to reduce the size significantly, swapping in a smaller library that may be more compact, with DTLS support (such as tinydtls) may help. The framework uses an internal abstraction layer for TLS (xp/tls/gg_tls.h), so swapping the TLS library from mbedlts library to something else should be fairly straightforward. The mbedtls implementation of that abstract API lives in xp/tls/ports/mbedtls.

[jagobagascon]

Perfect, thank you so much!