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I found da error in the code. I had been usin the wrong service name (rospy.ServiceProxy('digital_write', DigitalWrite). I changed it to 'arduino/digital_write' and its workin fine

I found da error in the code. I had been usin the wrong service name (rospy.ServiceProxy('digital_write', DigitalWrite). I changed it to 'arduino/digital_write' and its workin finefine. Thank you