The VAL application data/content is stored in the VAL server, or the SEALDD server, or other cloud platform. For the downlink traffic transmission, the SEALDD server retrieves the data/content of VAL application, by using one of the following modes:
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Downlink pull mode: the SEALDD server pulls the data/content of VAL application from the address provided by the VAL server (i.e. pull from the data/content address in VAL server over SEALDD-S interface, or in other cloud platform).
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Downlink push mode: the VAL server pushes the data/content of VAL application to the SEALDD server over SEALDD-S interface.
For the uplink traffic transmission, the SEALDD server sends the data/content of VAL application to the address provided by the VAL server, by using one of the following modes:
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Uplink pull mode: the VAL server pulls the data/content of VAL application from the SEALDD server over SEALDD-S interface.
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Uplink push mode: the SEALDD server pushes the data/content of VAL application to the address provided by the VAL server (i.e. push to the data/content address in VAL server over SEALDD-S interface, or in other cloud platform).