Returns the version of 'libnng' used and whether TLS is supported.
nng_version()
A character vector of length 2.
The environment variable 'NANONEXT_TLS' may be set, e.g. by
Sys.setenv(NANONEXT_TLS=1)
, prior to package installation to enable
TLS where the system NNG library has been built with TLS support (using
Mbed TLS). Note: this is not applicable to Windows systems.