Embodiments of the present disclosure relate to method and a system for managing a decentralized access to a resource. A user of a client device having a third-party application installed therein request to join the mesh network based on invite received from the owner of the IoT gateway. The mesh network comprises one or more IoT gateway. One gateway is identified based on the topology of the client device, and an optimal connection between the client device and the identified gateway is determined. The third-party application may send a resource access request for accessing a resource of the mesh network and access the requested resource through the optimal connection route thus determined. Thus, the disclosure enables a peer-to-peer mesh network infrastructure that allows secure access to the resource by a third-party application without using a cloud server to route the resource access request from the client device to the gateway.