Reasons for 'java.io.IOException: sendto failed: ENETUNREACH (Network is unreachable)' exception

This exception occurs when there's a problem with the network connectivity or the network route to the destination is not available. The ENETUNREACH error code indicates that the network is unreachable.

One possible reason for this exception is that the device is not connected to a network. Another reason could be that the network signal strength is low or the network is congested.

It could also be caused by a misconfigured network or firewall settings, which is preventing the device from connecting to the network.

To resolve this issue, check the network connectivity, signal strength, and ensure that the device is properly configured to connect to the network. You may also need to check the network settings and firewall settings to ensure that they are properly configured.