Unable to send ATZ command to ELM 327 after establishing connection with ELM327 in android

Question

I have written a code which is successfully able to find the paired OBD and establish the connection with ELM327 but when i am trying to send ATZ command the application get

Answer 1

The problem might be that after the prompt sign > no CR is sent from the ELM-device to the computer. If your serial input buffer is configured with termination by a CR, a timeout will happen.