Part 2 of the macOS ARM64 SDR lab port. A 9-daemon Osmocom 2G+3G core runs native on the LibreSDR B220, with SCTP shim v0.3.x, AF_UNIX SOCK_STREAM fallback for PCUIF, utun for GGSN, and Iu-CS/Iu-PS control plane complete against a patched hnb-test. Plus the LTE measurement kit run on the same hardware.
Frank Stevenson’s Kraken builds on Apple Silicon with three patches and a semaphore shim. CPU cracker only. Cross-checked against libosmocore.
A small passive SDR research lab on MacBook Pro M4 with LibreSDR B220 Mini. GSM BCCH decode from wideband capture, 35 2G and 34 4G cells inventoried across all Bucharest operators, full srsRAN LTE stack in loopback, native macOS ARM64. Notes on the four porting problems and the bitstream trap that looked like a UHD bug.
View toward Untersberg and Watzmann, from the southern slope of Obersalzberg.
Consumer Zigbee sensors report on change, not on schedule. A naive mean() weights every sample equally regardless of how much real time it stands for. When a transient produces hundreds of clustered samples, the monthly mean drifts by two or three degrees. Fix at query time with hourly pre-aggregation.