Sending Multiple Information from BNO055 IMU to BridgeClient on Yun
Apparently the solution to my problem was a simple client.println() after my JSON was ready to be printed to the BridgeClient. 

Snippet:

root.printTo(client); client.println();


where root is DynamicJsonBuffer from the ArduinoJson library. The client.println() would immediately print \n and this would be read by the readline() python code.