When launching Cloudsim bridges and field computers (FCs) on networks without multicast, it is necessary to configure the cyclonedds.xml file with peer information so that bridges and FCs can discover each other and exchange information.
The cyclonedds.xml configuration file requires a <Peer> entry with the IP of the peer on both containers looking to communicate using unicast. Each container contains the IP address of the other container it wants to connect to.
When launching in the cloud, IPs are not fixed, and they are not available until the container starts running, which is problematic due to the inherent cycle in the peer configuration. It is not possible to configure a container before launching, and it is not possible to launch a container before it is configured.
An optional env var MBZIRC_STALL_START_PATH was introduced that contains a path to a file, which when set, allows the container to run but stalls it from calling the launchfile until the file path exists. This allows for the configuration of the cyclonedds.xml file and any other additional configs before the bridge starts.
When launching Cloudsim bridges and field computers (FCs) on networks without multicast, it is necessary to configure the
cyclonedds.xmlfile with peer information so that bridges and FCs can discover each other and exchange information.The
cyclonedds.xmlconfiguration file requires a<Peer>entry with the IP of the peer on both containers looking to communicate using unicast. Each container contains the IP address of the other container it wants to connect to.When launching in the cloud, IPs are not fixed, and they are not available until the container starts running, which is problematic due to the inherent cycle in the peer configuration. It is not possible to configure a container before launching, and it is not possible to launch a container before it is configured.
An optional env var
MBZIRC_STALL_START_PATHwas introduced that contains a path to a file, which when set, allows the container to run but stalls it from calling the launchfile until the file path exists. This allows for the configuration of thecyclonedds.xmlfile and any other additional configs before the bridge starts.