make sure there is at least an noop callback
make sure there is at least an noop callback

masato/meshblu,Qbitus/meshblu,osokay/IotServerCore,atyenoria/meshblu,masato/meshblu-dev,ChemTics/meshblu,osokay/IotServerCore,jaambee/meshblu,Qbitus/meshblu,Qbitus/meshblu,ChemTics/meshblu,atyenoria/meshblu,masato/meshblu,dommert/meshblu,dommert/meshblu,ChemTics/meshblu,octoblu/meshblu,atyenoria/meshblu,jaambee/meshblu,osokay/IotServerCore,dommert/meshblu,octoblu/meshblu,masato/meshblu-dev,masato/meshblu-dev,jaambee/meshblu,masato/meshblu