1234. The device will also be tagged with qa so we can target it in our deployment group. We will select y when asked if we would like to generate device certificates. Device certificates are required for a device to establish a connection with the NervesHub server.nerves-hub in the current working directory. You can specify a different location by passing --path /path/to/certs to NervesHubCLI mix commands.nerves_hub.device burn IDENTIFIER. In this example, we are going to burn the firmware and certificates for device 1234 that we created.