I am having two contracts say A and B, and two nodes running in different machines Machine1 and Machine 2 with same network id and i had added the peer using node URL. Contract A is deployed by machine1 on blockchain, Contract B is deployed by machine2. Now I want to access the function of contract A from machine2 and machine 1 and also access the function of contract B from machine2 and machine 1. How can I access the functions