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feec05cdf2
read_frame was misuing the packet length in the following ways: - returning non-zero even if buf_len is too short for the packet - truncating the length to buf_len if len is too long then using the truncated (i.e. wrong) length to index into the buffer - memcpying too many bytes (used buf_len instead of real length) This commit fixes all of this and adds some code to report on packet length errors (to match with cc2538 driver).