The present invention relates to a system (1000) and method for an application data routing in an Internet of Things or IoT network. The system (1000) is configured to perform a cross-layer operation between application layer and network layer in order to determine an optimized communication link to transmit an application data from an IoT device (10) to a gateway (20) in the IoT network. The system (1000) comprises a network of at least one IoT device (10) and at least one gateway (20).