As of version 4.25, the OPC Router supports „Store and Forward“, which prevents data loss if the receiver (e.g. database server, MQTT broker) is not available or if the database cannot process requests fast enough. When these situations occur, the OPC Router records the data captured during the connection failure. As soon as connectivity is restored, the data is read on the OPC Router and subsequently transferred to the originally desired destination. Store and Forward is thus intended to buffer unstable communication channels that are not time-critical as well as without a response to be processed, and to transmit the data while communication is still established.
The Add-on is useful, for example, if the target systems (SAP, databases, etc.) fail for a short time, either planned or unplanned. Reasons for this can be maintenance, backups, malfunctions or even a network failure. In these cases, data gaps would occur, which are then retransmitted and closed with Store and Forward.
Even if statistical production data is collected in the cloud (for big data analysis), it is a great advantage to collect data locally in the event of a communication failure and transmit it later, as this data is not used directly for process control.