I haven't go through all the post and reply but what you have going on is similar with what i have done.
In my project, all the data are from PLC by Modbus Tcp directly. More than 300 float points should be read from it. And all the data will be write into influxDB by every result trigger.I am not care about the timestamp because all the data are write to database at the same time.The time gap between plc reading and database insert should less than 1s.You can set the msg.payload with tag information before write the data to influxdb. For grafara, you can deal with the data by tag group later.
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