stub for camping feature
explore target's endpoints
initial version of camping code feature
stubs for camper app
public interface for module
listen for available devices
adding requests
add requests hadling
move `sip_users_from_endpoints` to cf_util as `sip_users_from_device_ids`
make a call if target available now
Handle timeouts
offnet logic for camping feature
rename `camper_channel_tracker` to `camper_onnet_handler`
camper offnet initial version
update app's deps
update camper's exports
clear comments
handle offnet camp-on reqests
fix camper addition while `migrate`
fix minor pull request's issues