var response = {
  emitter_room: { type: "Emitter", volume: 20, units: "m^3" },
  receiver_room: { type: "Receiver", volume: 30, units: "m^3" },
  wall: { surface: 10, units: "m^2" }
}
var parsedResponse = JSON.stringify(response);

// note that the menthod `sendMessage` will encode the string to an `Uint8Array`
tcpConnection.sendMessage(parsedResponse + "\n", funciton (messageInfo) {
  console.log("Message sent", messageInfo)
})