Pre-Observation Script to run rtl_biast?

[danwhite]

See this reply for the root cause of the issue:

RTL-SDR.com wideband LNA w/RTL-SDR.com dongle bias-t

Recently tracked down the issue with why satnogs-client and activating the bias-T on the RTL-SDR blog v3 receiver works-but-doesn’t. The current version of GNU Radio that the Ansible scripts install is exactly 0.0.1 point revision older than required to support the bias-T. This is because it depends on a version of gr-osmosdr just before support was added for the feature, which in turn depends on a slightly-too-old version of librtlsdr that exposes the API / ABI for controlling the GPIO pins (…