Unable to echo different MAVROS topics

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Hello everyone,

I am using a raspberry pi for accessing Pixhawk cube black (PX4 firmware) data over mavros. I have connected a FTDI cable to Telem 2 port and set the MAV_1_Config parameters.

I am able to launch MAVROS successfully and I am able to execute

rostopic echo /mavro/state

however when I try to execute

rostopic echo /mavros/imu/data or rostopic echo /mavros/local_position/pose

I do not receive any output.

I also tried setting up the mavros stream rate using

rosservice call /mavros/set_stream_rate 0 10 1

the command execute without any errors but still I am not receiving any data in different rostopics.

Please suggest, I would really appreciate the help. Thank you.