If msg.payload holds comma separated values (csv), Key and msg.topic is ignored and the key will
- be automatically generated by Emoncms. If msg.payload holds a single value and Key and msg.topic is not specified, msg.payload
- will be treated as a csv otherwise it will be treated as a json payload and the key value can be manually or programmatically set.
- Key is not mandatory, if Key is left blank msg.topic will used. Key overrides msg.topic, it will be ignored if msg.payload is holding csv
- Node (numeric) is not mandatory, if Node is left blank msg.nodegrpup will used. Node over rides msg.nodegroup.
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