ID 101 and 114 not subscribing about ros-multiwii

[christianrauch]

The message ID <id> not subscribed error is shown for messages, that are not subscribed but for which a update rate is set via the dynamic config:

ros-multiwii/src/multiwii_node.cpp

Lines 162 to 187 in 833f8b5

	void dynconf_callback(multiwii::UpdateRatesConfig &config, uint32_t /*level*/) {
	// define map with matching update rate per message ID
	const std::map<msp::ID, double> msp_rates = {
	{msp::ID::MSP_STATUS, config.MSP_STATUS},
	{msp::ID::MSP_RAW_IMU, config.MSP_RAW_IMU},
	{msp::ID::MSP_ALTITUDE, config.MSP_ALTITUDE},
	{msp::ID::MSP_ATTITUDE, config.MSP_ATTITUDE},
	{msp::ID::MSP_RC, config.MSP_RC},
	{msp::ID::MSP_SERVO, config.MSP_SERVO},
	{msp::ID::MSP_MOTOR, config.MSP_MOTOR},
	{msp::ID::MSP_SERVO, config.MSP_SERVO},
	{msp::ID::MSP_MISC, config.MSP_MISC},
	{msp::ID::MSP_ANALOG, config.MSP_ANALOG},
	{msp::ID::MSP_SONAR_ALTITUDE, config.MSP_SONAR_ALTITUDE},
	};
	// apply update
	for(const auto& r : msp_rates) {
	if(fcu->hasSubscription(r.first)) {
	fcu->getSubscription(r.first)->setTimerFrequency(r.second);
	}
	else {
	std::cerr<<"message ID "<<uint(r.first)<<" not subscribed"<<std::endl;
	}
	}
	}

These are the messages the node subscribes to:

ros-multiwii/src/multiwii_node.cpp

Lines 393 to 400 in 833f8b5

	node.fc().subscribe(&MultiWiiNode::onImu, &node);
	node.fc().subscribe(&MultiWiiNode::onAttitude, &node);
	node.fc().subscribe(&MultiWiiNode::onAltitude, &node);
	node.fc().subscribe(&MultiWiiNode::onRc, &node);
	node.fc().subscribe(&MultiWiiNode::onServo, &node);
	node.fc().subscribe(&MultiWiiNode::onMotor, &node);
	node.fc().subscribe(&MultiWiiNode::onAnalog, &node);
	node.fc().subscribe(&MultiWiiNode::onSonarAltitude, &node);

The set of message for which a update rate is set, is larger than the set of subscribed messages (MSP_STATUS (101), MSP_MISC (114)). I guess these are some leftovers from a cleanup. You can ignore this message.

The messages Version marker is not recognised! and Message marker is not recognised! are given because the header markers $ and M (version 1) or X (version 2) cannot be recognised. This could be caused by communication errors. Are you getting some valid messages or are all messages corrupted like this?

Since those are given by the library (and not the node), can you make sure that the library is giving you the subscribed messages? E.g. test a standalone executable without ROS that is subscribing to the same messages.

[christianrauch]

I removed the MSP_STATUS and MSP_MISC from the rate configuration.
@PatrickCesar Are you still getting errors when reading the marker on a standalone (non-ROS) example?