Current Internet of Things (IoTs) development requires service distribution over Wireless Sensor and Actor Networks (WSANs) to deal with the drastic increasing of network management complexity. Because of the specific constraints of WSAN, centralized approaches are strongly limited. Multi-hop communication used by WSAN introduces transmission latency, packet errors, router congestion and security issues. As it uses local services, a decentralized service model avoids long path communications between nodes and applications. But the main issue is then to have such local services installed on the desired nodes.