  Based on our dedicated Swift monitoring program, MOMO, OJ 287 is one of the
best-monitored blazars in the X-ray--UV--optical regime. Here, we report
results from our accompanying, dense, multi-frequency (1.4--44 GHz) radio
monitoring of OJ 287 between 2015 and 2022 covering a broad range of activity
states. Fermi gamma-ray observations are added. We characterize the radio flux
and spectral variability in detail, including DCF and other variability
analyses, and discuss its connection with the multiwavelength emission. Deep
fades of radio and optical--UV fluxes are found to occur every 1--2 years.
Further, it is shown that a precursor flare of thermal bremsstrahlung predicted
by one of the binary supermassive black hole (SMBH) models of OJ 287 was
absent. We then focus on the nature of the extraordinary, nonthermal 2016/2017
outburst that we initially discovered with Swift. We interpret it as the latest
of the famous optical double-peaked outbursts of OJ 287, favoring binary
scenarios that do not require a highly precessing secondary SMBH.
