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I have multiple Pi's connected to a miner in a private network, where one pi is collecting sensor data, and am able to send ether from all the devices and they are all synchronised with the private blockchain.

How can a smart contract request data from pi B and Pi A sends the data back automatically

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What you want to achieve can be implemented using an oracle.

  • Your smart contract generates an event RequestData(uint id), where id can be an identification of the raspberry pi.
  • An application is listening for events in your blockchain. When a RequestData(uint id) arrives it will make the request to the corresponding raspberry pi.
  • When the data is acquired it will be send by the application to your smart contract, for example it will call a function sendData(id, data).

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