[Rock-dev] Component does not read input port even though the previous is writing on its output port.

[Martin.Azkarate at esa.int]

Hello Diego,

Just a quick check that might be useful. Have you tried changing 
readNewest by a readNew? 
I had unexpected behaviour with readNewest in the past, and found that 
readNew is doing what I would expect from readNewest, as long as your port 
connection does not have a buffer.

Maybe your issue is unrelated but it should take you very little time to 
try.

Cheers,
Martin
Martin Azkarate
TEC-MMA
HE Space for ESA - European Space Agency
Space Automation and Robotics Engineer 
ESTEC - European Space research and TEchnology Centre
Keplerlaan 1, 2201 AZ Noordwijk 
The Netherlands 
Martin.Azkarate at esa.int | www.esa.int 
Tel +31 71 565 3480 | Mob +31 650 625 564 



From:   Diego Cesar <diego.b.cesar at gmail.com>
To:     rock-dev at dfki.de
Date:   04/12/2017 16:46
Subject:        [Rock-dev] Component does not read input port even though 
the previous is writing on its output port.
Sent by:        rock-dev-bounces at dfki.de



Hello guys, 

Recently I had a problem on the component `auv_control:PIDController` 
going to `POSE TIMEOUT` state.

The point, however, is that looking to the logs, the pose feedback 
component is writing samples on its output port. So the `readNewest` on 
this line is not returning "RTT::NewData".

Additionally I found this message on 
"orocos.auv_control_aligned_vel2body_effort-XXX.txt", related to "mqueue" 
that may be related to this issue:  


140.289 [ ERROR  ][MQSendRecv] FAILED opening 
'/auv_control_aligned_vel2body_effort.pose_samples.0x7f627c0051b0 at 400' 
with message size 516, buffer size 10 for reading :
140.289 [ ERROR  ][MQSendRecv] Insufficient space for the creation of a 
new message queue.  This probably occurred because the queues_max limit 
was encountered; see mq_overview(7).
140.290 [ ERROR  ][CDataFlowInterface_i::buildChannelOutput] Failed to 
create MQueue Channel element: Could not open message queue: mq_open 
returned -1.
140.290 [ ERROR  ][CDataFlowInterface_i::buildChannelOutput] The type 
transporter for type /base/samples/RigidBodyState failed to create an 
out-of-band endpoint for port pose_samples
141.308 [ Debug  ][CDataFlowInterface_i::createConnection]

This message is printed repetitively until the component breaks. 

I'd like to ask if any of you have already had this problem or if the 
"mqueue" message can somehow be related to it. If not, which would be the 
reasons that could lead to this symptom.

Best Regards, 

Diego Cesar
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