Hi, just wanna give my contribution to the community.
Following is the serial gateway code with support of auto ID, which is still missing in the latest of MySensor (1.4) library (CMIIW).
Over 4 years on, and my node ran continuously sending 4 messages every 5 minutes.
It's 700mAh LiFePo4 battery voltage dropped from initial 3.45V to 3.24V, according to LiFePo4 voltge/SoC tables It's just under 40% left.
700*60% = 420mAh. 100 mAH per year. using library 2.40 and blob message I could cut usage to ~25mAh/year, not bad
