Script Adapter (Pull)

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Script Adapter Fields

Connect JS Script	String	Script to be executed to connect to target device and set up listener. Script Tags can be used to do various jobs like sending, receiving, alerting, logging, publishing instruction to other adapters.
Disconnect JS Script	String	Script to be executed to disconnect to target device and clean up listener. Context var 'connection_val' holds return value of read connection script's return value. Context var 'executor_val', 'transient_val', 'presistent_val', 'kvstore_val' and 'logger_val' are available.
Write Connection JS Script	String	Script to be executed while executing instruction. Context var 'instruction_val' is set to instruction json values. Context var 'transient_val', 'presistent_val', 'kvstore_val' and 'logger_val' are available.
Additional Java library URLs	String	URL paths of additional Java libraries (.jar) required by this connection and associated read/write tag scripts. All library URL paths must be comma seperated. e.g. file:/c:/mongo-driver/mongo-java-driver-3.6.2.jar, file:/c:/mongo-driver/snappy-java-1.1.4.jar
Tag JS Script	String	Script to be executed during each to retrieve Tag value. Context var 'scan_val' holds received value of current scan. In case of write tag, context var 'tag_val' holds tag value set by instruction and 'connection_val' holds return value of write connection script. Context var 'transient_val', 'presistent_val', 'kvstore_val' and 'logger_val' are available.

Script Tags

executor_val	Is available for firing async tasks. Ex. This can be used to schedule at intervals etc.
sender_val	Sends value which is available in the scan_val for the tags. Example - sender_val.send() Usage - send(Object scanValue)
transient_val	In memory map and can be used across connect/disconnect and through different adapters. Usage - transient_val.put(Object value)
persistent_val	In memory file storage map which can be used across restart of Edge. Usage - persistent_val.put(Object value)
kvstore_val	Can be used to create custom persistent maps.
logger_val	Used for logging. Example - logger_val.info()
reciever_val	Receive values from other adapters which have send/scan internal set in their settings. Example - reciever_val.register() Usage - register(String adapterId, String messageType, Consumer<String> consumer) Pass consumer by implementing method 'accept' which consumes the received message.
writer_val	This variable is used for publishing instruction to other sources (adapters). Example - writer_val.write() Usage - write(String adapterId, String thingKey, String instructionJson)
alerter_val	This variable is used to generate alerts. Usage - alerter_val.alert() Usage - alert(String alertType, String message, String dataJson) alert types - INFO, WARNING, ERROR, CRITICAL
scan_val	This variable contains the value of the sent value which was sent using sender_val.send
tag_val	This variable contains the value of the write tag that is to be set by the instruction received by Edge.
connection_val	This holds the return value of the connect script.

Adding Edge certificate to the trusted list

On configuring the Datonis Edge Gateway, it will error out with a certificate error: ServiceResultException: Bad_CertificateInvalid (0x80120000) "The certificate provided as a parameter is not valid.

In the OPC UA configuration window, select the Trusted Clients tab, you will find a new entry for 'OPC UA Adapter'. Right click it and select “Trust”. Disable and enable Gateway again.