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Re: [Discuss-gnuradio] INFO: Detected an invalid packet at item INFO: Pa

From: Bastian Bloessl
Subject: Re: [Discuss-gnuradio] INFO: Detected an invalid packet at item INFO: Parser returned #f
Date: Thu, 29 Jan 2015 17:43:12 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.3.0


On 01/29/2015 03:13 PM, zs wrote:
Can you tell me,for general,in which circumstance,the packet header maybe 

This is very hard to tell since I don't know what you are doing. I guess you use a header_formatter in your flow graph and (for whatever reason) its header_parse method returns false.

For example with the default header it looks like this happens if the CRC is not correct


At 2015-01-29 20:44:13, "Bastian Bloessl" <address@hidden> wrote:

On 01/29/2015 01:03 PM, zs wrote:
Detected an invalid packet at item INFO: Parser returned #f".
The answer may be "RF settings are distorting your signal" or others.I
want to ask a question.Which block in gnuradio give us this hint.Where
is the source code of the block?And have someone can help me to explain
this problem more details?Why will have this error/warning?

~/src/gnuradio >> ack-grep -C 3 "an invalid packet"
80-      );
82-      if (!d_header_formatter->header_parser(in, tags)) {
83:     GR_LOG_INFO(d_logger, boost::format("Detected an invalid packet at
item %1%") % nitems_read(0));
84-     message_port_pub(msg_port_id, pmt::PMT_F);
85-      } else {
86-     pmt::pmt_t dict(pmt::make_dict());

I guess your packet header is corrupt.


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