Apologies I forgot that another setting is needed to restrict nodes to node list only, This is covered in more detail in my post here EmonHub autoconf and nodelistonly settings
Another setting nodelistonly = 1
needs to be added to the SPI interfacer:
[[SPI]]
Type = EmonHubRFM69LPLInterfacer
[[[init_settings]]]
nodeid = 5
networkID = 210
resetPin = 24
selPin = 16
[[[runtimesettings]]]
pubchannels = ToEmonCMS,
nodelistonly = 1