I basically want to do 2 different things if Possible.
1. To get more details for a parameter without sending frequent updates. For example sampling a variable every 5 seconds and updating thingspeak field with 12 values every minute. It seems like that can be done per your suggestion above like below? Is the syntax correct?
https://api.thingspeak.com/update?api_key=xxxxxxxxxxxxxxxx&field1=2.2andSecondData2.4andThirdData4.5...andTwelvthData6.3&
2. To draw more than one trace in the same field for comparison purposes. For example plotting temperature and humidity in the same graph. And for this the second update that uses 'created at' can be employed requiring as many updates as the plots needed per time instance. Correct?