Unable to compile datalogger/telelogger: undefined reference to handlerControl

[molisani]

Freematics/firmware_v5/telelogger/dataserver.cpp

Line 54 in bf282f4

int handlerControl(UrlHandlerParam* param);

This function definition has no implementation, unlike with the gps_logger or garden_controller. I feel like I'm missing something, where is the implementation for handlerControl for datalogger and telelogger? Commenting out references allows it to compile, but that isn't wanted.