Mikko Ohtamaa
2020-04-11 17:56:05
There are two ways to get output from the smart contracts
You read the state directly using the smart contract ABI and calls
The transaction contains Solidity events which you can parse from the transaction logs
For both cases the support has to be written to the smart contract and in this question the smart contract code itself is missing, so it is not possible to tell exactly how to do it.
Generally, nodes do not support reading historical state. They support reading historical event logs though, so if you need to access the data over time series then you need to write your smart contract so that it emits events.