v3.0.1

fix: fix datagram format

feat: add rate limiter to sender

fix: optimize log output

fix: ota update writes OTA_HOST to NVS if provided

fix: simplify ota update guard

fix: de-activate marker during ota

fix: try to fix corrupted NVS by adding a guard variable

fix: increase UART buffer len

feat: add submodule rfmarkit-interface-ng