andreasvo's profile - activity

The problem is solved! I realized the subscriber object might also have a sub.getNumPublishers(), this way I could chec

Hi,

Im trying to use a specific node (program A) as a test program being executed once taking the value to be published on a topic (lets call it "foo").

Program B is already subscribed to this topic and is running in a loop.

Program A will be ran like this: "rosrun package node argument", and published the argument (a number) to topic "foo".

program B never receives this message. My idea at this point is the fact that they never get to pair up with tcp with the use of the master node since the subscribing node isnt really subscribed.

Is there any way of making this executable able to send to the looped node B? or is there a specific reason this doesnt work?

I know this might seem like a stupid idea, but it is necessary for testing of the robot, and I dont know how to pass values to a running node for it to then publish.

In advance, thanks.

pub.getNumSubscribers() gave 0.

The code is large, this is the chain of events though: A topic holder node starts the topic and holds it alive. Subscr

One time publish executable Hi, Im trying to use a specific node (program A) as a test program being executed once taki

One time publish executable Hi, Im trying to use a specific node (program A) as a test program being executed once taki

Hi,

Im working with an autonomous sailboat with a raspberry pi 3 that uses these sensors:

Gill Ultrasonic Windsensor

MTi-G xsesnsor (gyro and gps data)

Im having an issue related to the c++ program that connects my software to the wind sensor. The problem is that the wind sensor will connect to usb1 staticly (using serial) in which it will be pure luck that this is the correct usb as it is dynamically assigned when inserted. The xsensor on the other hand will find itself with the driver I got from ROS git rep. Problem occurs when the wind sensor driver will try to use the same USBx as the xsens driver, resulting in the xsens crashing.

Is there a way to physically assign say, USB0 to always be the bottom right usb on the raspberry pi? and if so how?

I've tried to google this alot without any good results.

I'm using Ubuntu mate for ROS by the way.

Thank you gvdhoorn! udev is just what I was looking for. Yes, not a ROS problem at all. Just wanted to hear here first

USB Sensors mess with each other, ROS Ubuntu Mate Hi, Im working with an autonomous sailboat with a raspberry pi 3 that

USB sensor crash another, RbPi3 Hi, Im working with an autonomous sailboat with a raspberry pi 3 that uses these sensor

Thanks, that makes a lot of sense now!

Hi,

A fellow and I are working on an Autonomous boat project, and while building catkin folders, we struggled with normal use of catkin_make. Tutorials referred to the option -j2 as argument. What does this actually do? we are using a raspberry pi 3b with ubuntu mate.

Thanks - Andreas

Hi,

Me and a fellow student is working on an Autonomous boat project, and while building catkin folders, we struggled with normal use of catkin_make. Tutorials referred to the option -j2 as argument. What does this actually do? we are using a raspberry pi 3b with ubuntu mate.

Thanks - Andreas