[BLE sample] Log sleep interval and encoding on boot

[ryanrolds]

• Adding configuration logging to start-up
• Added more detail to the BLE project configuration

[rbaron]

Please use a more descriptive commit message title. Something like "[BLE sample] Log sleep interval and encoding on boot".

[rbaron]

I would refrain from exhaustively listing options in the prj.conf file. Reasoning:

• Why list some configs and not others?
• Why only in prj.conf and not prj_debug.conf?
• More importantly, this list will go stale once we add or remove some of these options.

A quick example and pointing to Kconfig for details is enough, as before.

[rbaron]

Add unit " ms"

[rbaron]

This will silently output nothing when new encoding schemes are introduced. We have this information at compile time, we can also avoid paying the binary size cost for all these strings.

static void dump_config() {

#if IS_ENABLED(CONFIG_PRST_BLE_ENCODING_BTHOME_V2)
// Only capitalize first letter.
  LOG_INFO("Payload encoding: BTHOME_V2");
#else if ...
...
#else
#error "Unhandled CONFIG_PRST_BLE_ENCODING_ choice in dump_config()"
#endif

  LOG_INF("Sleep duration: %d ms", CONFIG_PRST_SLEEP_DURATION_MSEC);
}

int main(void) {
  ...

  dump_config();

  ...
}

[ryanrolds]

Thank you for the feedback. I will correct my PR in the next few days.

[ryanrolds]

This hasn't fallen off my rader. I've had a lot going on.