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I'm getting closer.
Now when I try to connect the publisher script shows this. The publisher is publishing 6 UInt16 variables, is the problem that I'm only subscribing to one of them? Or is the topic type not really UInt16 but a new type made up of 6 UInt16s?
[WARN] [WallTime: 1339714526.664093] Could not process inbound connection: topic types do not match: [std_msgs/UInt16] vs. [rosserial_arduino/Adc]{'message_definition': 'uint16 data\n\n', 'callerid': '/listener', 'tcp_nodelay': '0', 'md5sum': '1df79edf208b629fe6b81923a544552d', 'topic': '/adc', 'type': 'std_msgs/UInt16'}