More on relaying messages can be found here: https://meshtastic.discourse.group/t/how-do-multiple-mesh-networks-interact-if-at-all
Current max hop count is 3 (https://meshtastic.discourse.group/t/how-many-hops-can-lora-do )
(Additional information can be found here: https://meshtastic.discourse.group/t/headless-base-station-repeater )