ozgur erbulan
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ros_lib_kinetic
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Gary Servin
Diff: ros/node_handle.h
- Revision:
- 0:9e9b7db60fd5
diff -r 000000000000 -r 9e9b7db60fd5 ros/node_handle.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/ros/node_handle.h Sat Dec 31 00:48:34 2016 +0000
@@ -0,0 +1,543 @@
+/*
+ * Software License Agreement (BSD License)
+ *
+ * Copyright (c) 2011, Willow Garage, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ * * Neither the name of Willow Garage, Inc. nor the names of its
+ * contributors may be used to endorse or promote prducts derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef ROS_NODE_HANDLE_H_
+#define ROS_NODE_HANDLE_H_
+
+#include <stdint.h>
+
+#include "std_msgs/Time.h"
+#include "rosserial_msgs/TopicInfo.h"
+#include "rosserial_msgs/Log.h"
+#include "rosserial_msgs/RequestParam.h"
+
+#define SYNC_SECONDS 5
+
+#define MODE_FIRST_FF 0
+/*
+ * The second sync byte is a protocol version. It's value is 0xff for the first
+ * version of the rosserial protocol (used up to hydro), 0xfe for the second version
+ * (introduced in hydro), 0xfd for the next, and so on. Its purpose is to enable
+ * detection of mismatched protocol versions (e.g. hydro rosserial_python with groovy
+ * rosserial_arduino. It must be changed in both this file and in
+ * rosserial_python/src/rosserial_python/SerialClient.py
+ */
+#define MODE_PROTOCOL_VER 1
+#define PROTOCOL_VER1 0xff // through groovy
+#define PROTOCOL_VER2 0xfe // in hydro
+#define PROTOCOL_VER PROTOCOL_VER2
+#define MODE_SIZE_L 2
+#define MODE_SIZE_H 3
+#define MODE_SIZE_CHECKSUM 4 // checksum for msg size received from size L and H
+#define MODE_TOPIC_L 5 // waiting for topic id
+#define MODE_TOPIC_H 6
+#define MODE_MESSAGE 7
+#define MODE_MSG_CHECKSUM 8 // checksum for msg and topic id
+
+
+#define MSG_TIMEOUT 20 //20 milliseconds to recieve all of message data
+
+#include "ros/msg.h"
+
+namespace ros {
+
+ class NodeHandleBase_{
+ public:
+ virtual int publish(int id, const Msg* msg)=0;
+ virtual int spinOnce()=0;
+ virtual bool connected()=0;
+ };
+}
+
+#include "ros/publisher.h"
+#include "ros/subscriber.h"
+#include "ros/service_server.h"
+#include "ros/service_client.h"
+
+namespace ros {
+
+ using rosserial_msgs::TopicInfo;
+
+ /* Node Handle */
+ template<class Hardware,
+ int MAX_SUBSCRIBERS=25,
+ int MAX_PUBLISHERS=25,
+ int INPUT_SIZE=512,
+ int OUTPUT_SIZE=512>
+ class NodeHandle_ : public NodeHandleBase_
+ {
+ protected:
+ Hardware hardware_;
+
+ /* time used for syncing */
+ uint32_t rt_time;
+
+ /* used for computing current time */
+ uint32_t sec_offset, nsec_offset;
+
+ uint8_t message_in[INPUT_SIZE];
+ uint8_t message_out[OUTPUT_SIZE];
+
+ Publisher * publishers[MAX_PUBLISHERS];
+ Subscriber_ * subscribers[MAX_SUBSCRIBERS];
+
+ /*
+ * Setup Functions
+ */
+ public:
+ NodeHandle_() : configured_(false) {
+
+ for(unsigned int i=0; i< MAX_PUBLISHERS; i++)
+ publishers[i] = 0;
+
+ for(unsigned int i=0; i< MAX_SUBSCRIBERS; i++)
+ subscribers[i] = 0;
+
+ for(unsigned int i=0; i< INPUT_SIZE; i++)
+ message_in[i] = 0;
+
+ for(unsigned int i=0; i< OUTPUT_SIZE; i++)
+ message_out[i] = 0;
+
+ req_param_resp.ints_length = 0;
+ req_param_resp.ints = NULL;
+ req_param_resp.floats_length = 0;
+ req_param_resp.floats = NULL;
+ req_param_resp.ints_length = 0;
+ req_param_resp.ints = NULL;
+ }
+
+ Hardware* getHardware(){
+ return &hardware_;
+ }
+
+ /* Start serial, initialize buffers */
+ void initNode(){
+ hardware_.init();
+ mode_ = 0;
+ bytes_ = 0;
+ index_ = 0;
+ topic_ = 0;
+ };
+
+ /* Start a named port, which may be network server IP, initialize buffers */
+ void initNode(char *portName){
+ hardware_.init(portName);
+ mode_ = 0;
+ bytes_ = 0;
+ index_ = 0;
+ topic_ = 0;
+ };
+
+ protected:
+ //State machine variables for spinOnce
+ int mode_;
+ int bytes_;
+ int topic_;
+ int index_;
+ int checksum_;
+
+ bool configured_;
+
+ /* used for syncing the time */
+ uint32_t last_sync_time;
+ uint32_t last_sync_receive_time;
+ uint32_t last_msg_timeout_time;
+
+ public:
+ /* This function goes in your loop() function, it handles
+ * serial input and callbacks for subscribers.
+ */
+
+
+ virtual int spinOnce(){
+
+ /* restart if timed out */
+ uint32_t c_time = hardware_.time();
+ if( (c_time - last_sync_receive_time) > (SYNC_SECONDS*2200) ){
+ configured_ = false;
+ }
+
+ /* reset if message has timed out */
+ if ( mode_ != MODE_FIRST_FF){
+ if (c_time > last_msg_timeout_time){
+ mode_ = MODE_FIRST_FF;
+ }
+ }
+
+ /* while available buffer, read data */
+ while( true )
+ {
+ int data = hardware_.read();
+ if( data < 0 )
+ break;
+ checksum_ += data;
+ if( mode_ == MODE_MESSAGE ){ /* message data being recieved */
+ message_in[index_++] = data;
+ bytes_--;
+ if(bytes_ == 0) /* is message complete? if so, checksum */
+ mode_ = MODE_MSG_CHECKSUM;
+ }else if( mode_ == MODE_FIRST_FF ){
+ if(data == 0xff){
+ mode_++;
+ last_msg_timeout_time = c_time + MSG_TIMEOUT;
+ }
+ else if( hardware_.time() - c_time > (SYNC_SECONDS)){
+ /* We have been stuck in spinOnce too long, return error */
+ configured_=false;
+ return -2;
+ }
+ }else if( mode_ == MODE_PROTOCOL_VER ){
+ if(data == PROTOCOL_VER){
+ mode_++;
+ }else{
+ mode_ = MODE_FIRST_FF;
+ if (configured_ == false)
+ requestSyncTime(); /* send a msg back showing our protocol version */
+ }
+ }else if( mode_ == MODE_SIZE_L ){ /* bottom half of message size */
+ bytes_ = data;
+ index_ = 0;
+ mode_++;
+ checksum_ = data; /* first byte for calculating size checksum */
+ }else if( mode_ == MODE_SIZE_H ){ /* top half of message size */
+ bytes_ += data<<8;
+ mode_++;
+ }else if( mode_ == MODE_SIZE_CHECKSUM ){
+ if( (checksum_%256) == 255)
+ mode_++;
+ else
+ mode_ = MODE_FIRST_FF; /* Abandon the frame if the msg len is wrong */
+ }else if( mode_ == MODE_TOPIC_L ){ /* bottom half of topic id */
+ topic_ = data;
+ mode_++;
+ checksum_ = data; /* first byte included in checksum */
+ }else if( mode_ == MODE_TOPIC_H ){ /* top half of topic id */
+ topic_ += data<<8;
+ mode_ = MODE_MESSAGE;
+ if(bytes_ == 0)
+ mode_ = MODE_MSG_CHECKSUM;
+ }else if( mode_ == MODE_MSG_CHECKSUM ){ /* do checksum */
+ mode_ = MODE_FIRST_FF;
+ if( (checksum_%256) == 255){
+ if(topic_ == TopicInfo::ID_PUBLISHER){
+ requestSyncTime();
+ negotiateTopics();
+ last_sync_time = c_time;
+ last_sync_receive_time = c_time;
+ return -1;
+ }else if(topic_ == TopicInfo::ID_TIME){
+ syncTime(message_in);
+ }else if (topic_ == TopicInfo::ID_PARAMETER_REQUEST){
+ req_param_resp.deserialize(message_in);
+ param_recieved= true;
+ }else if(topic_ == TopicInfo::ID_TX_STOP){
+ configured_ = false;
+ }else{
+ if(subscribers[topic_-100])
+ subscribers[topic_-100]->callback( message_in );
+ }
+ }
+ }
+ }
+
+ /* occasionally sync time */
+ if( configured_ && ((c_time-last_sync_time) > (SYNC_SECONDS*500) )){
+ requestSyncTime();
+ last_sync_time = c_time;
+ }
+
+ return 0;
+ }
+
+
+ /* Are we connected to the PC? */
+ virtual bool connected() {
+ return configured_;
+ };
+
+ /********************************************************************
+ * Time functions
+ */
+
+ void requestSyncTime()
+ {
+ std_msgs::Time t;
+ publish(TopicInfo::ID_TIME, &t);
+ rt_time = hardware_.time();
+ }
+
+ void syncTime(uint8_t * data)
+ {
+ std_msgs::Time t;
+ uint32_t offset = hardware_.time() - rt_time;
+
+ t.deserialize(data);
+ t.data.sec += offset/1000;
+ t.data.nsec += (offset%1000)*1000000UL;
+
+ this->setNow(t.data);
+ last_sync_receive_time = hardware_.time();
+ }
+
+ Time now()
+ {
+ uint32_t ms = hardware_.time();
+ Time current_time;
+ current_time.sec = ms/1000 + sec_offset;
+ current_time.nsec = (ms%1000)*1000000UL + nsec_offset;
+ normalizeSecNSec(current_time.sec, current_time.nsec);
+ return current_time;
+ }
+
+ void setNow( Time & new_now )
+ {
+ uint32_t ms = hardware_.time();
+ sec_offset = new_now.sec - ms/1000 - 1;
+ nsec_offset = new_now.nsec - (ms%1000)*1000000UL + 1000000000UL;
+ normalizeSecNSec(sec_offset, nsec_offset);
+ }
+
+ /********************************************************************
+ * Topic Management
+ */
+
+ /* Register a new publisher */
+ bool advertise(Publisher & p)
+ {
+ for(int i = 0; i < MAX_PUBLISHERS; i++){
+ if(publishers[i] == 0){ // empty slot
+ publishers[i] = &p;
+ p.id_ = i+100+MAX_SUBSCRIBERS;
+ p.nh_ = this;
+ return true;
+ }
+ }
+ return false;
+ }
+
+ /* Register a new subscriber */
+ template<typename SubscriberT>
+ bool subscribe(SubscriberT& s){
+ for(int i = 0; i < MAX_SUBSCRIBERS; i++){
+ if(subscribers[i] == 0){ // empty slot
+ subscribers[i] = static_cast<Subscriber_*>(&s);
+ s.id_ = i+100;
+ return true;
+ }
+ }
+ return false;
+ }
+
+ /* Register a new Service Server */
+ template<typename MReq, typename MRes>
+ bool advertiseService(ServiceServer<MReq,MRes>& srv){
+ bool v = advertise(srv.pub);
+ for(int i = 0; i < MAX_SUBSCRIBERS; i++){
+ if(subscribers[i] == 0){ // empty slot
+ subscribers[i] = static_cast<Subscriber_*>(&srv);
+ srv.id_ = i+100;
+ return v;
+ }
+ }
+ return false;
+ }
+
+ /* Register a new Service Client */
+ template<typename MReq, typename MRes>
+ bool serviceClient(ServiceClient<MReq, MRes>& srv){
+ bool v = advertise(srv.pub);
+ for(int i = 0; i < MAX_SUBSCRIBERS; i++){
+ if(subscribers[i] == 0){ // empty slot
+ subscribers[i] = static_cast<Subscriber_*>(&srv);
+ srv.id_ = i+100;
+ return v;
+ }
+ }
+ return false;
+ }
+
+ void negotiateTopics()
+ {
+ rosserial_msgs::TopicInfo ti;
+ int i;
+ for(i = 0; i < MAX_PUBLISHERS; i++)
+ {
+ if(publishers[i] != 0) // non-empty slot
+ {
+ ti.topic_id = publishers[i]->id_;
+ ti.topic_name = (char *) publishers[i]->topic_;
+ ti.message_type = (char *) publishers[i]->msg_->getType();
+ ti.md5sum = (char *) publishers[i]->msg_->getMD5();
+ ti.buffer_size = OUTPUT_SIZE;
+ publish( publishers[i]->getEndpointType(), &ti );
+ }
+ }
+ for(i = 0; i < MAX_SUBSCRIBERS; i++)
+ {
+ if(subscribers[i] != 0) // non-empty slot
+ {
+ ti.topic_id = subscribers[i]->id_;
+ ti.topic_name = (char *) subscribers[i]->topic_;
+ ti.message_type = (char *) subscribers[i]->getMsgType();
+ ti.md5sum = (char *) subscribers[i]->getMsgMD5();
+ ti.buffer_size = INPUT_SIZE;
+ publish( subscribers[i]->getEndpointType(), &ti );
+ }
+ }
+ configured_ = true;
+ }
+
+ virtual int publish(int id, const Msg * msg)
+ {
+ if(id >= 100 && !configured_)
+ return 0;
+
+ /* serialize message */
+ uint16_t l = msg->serialize(message_out+7);
+
+ /* setup the header */
+ message_out[0] = 0xff;
+ message_out[1] = PROTOCOL_VER;
+ message_out[2] = (uint8_t) ((uint16_t)l&255);
+ message_out[3] = (uint8_t) ((uint16_t)l>>8);
+ message_out[4] = 255 - ((message_out[2] + message_out[3])%256);
+ message_out[5] = (uint8_t) ((int16_t)id&255);
+ message_out[6] = (uint8_t) ((int16_t)id>>8);
+
+ /* calculate checksum */
+ int chk = 0;
+ for(int i =5; i<l+7; i++)
+ chk += message_out[i];
+ l += 7;
+ message_out[l++] = 255 - (chk%256);
+
+ if( l <= OUTPUT_SIZE ){
+ hardware_.write(message_out, l);
+ return l;
+ }else{
+ logerror("Message from device dropped: message larger than buffer.");
+ return -1;
+ }
+ }
+
+ /********************************************************************
+ * Logging
+ */
+
+ private:
+ void log(char byte, const char * msg){
+ rosserial_msgs::Log l;
+ l.level= byte;
+ l.msg = (char*)msg;
+ publish(rosserial_msgs::TopicInfo::ID_LOG, &l);
+ }
+
+ public:
+ void logdebug(const char* msg){
+ log(rosserial_msgs::Log::ROSDEBUG, msg);
+ }
+ void loginfo(const char * msg){
+ log(rosserial_msgs::Log::INFO, msg);
+ }
+ void logwarn(const char *msg){
+ log(rosserial_msgs::Log::WARN, msg);
+ }
+ void logerror(const char*msg){
+ log(rosserial_msgs::Log::ERROR, msg);
+ }
+ void logfatal(const char*msg){
+ log(rosserial_msgs::Log::FATAL, msg);
+ }
+
+ /********************************************************************
+ * Parameters
+ */
+
+ private:
+ bool param_recieved;
+ rosserial_msgs::RequestParamResponse req_param_resp;
+
+ bool requestParam(const char * name, int time_out = 1000){
+ param_recieved = false;
+ rosserial_msgs::RequestParamRequest req;
+ req.name = (char*)name;
+ publish(TopicInfo::ID_PARAMETER_REQUEST, &req);
+ uint16_t end_time = hardware_.time() + time_out;
+ while(!param_recieved ){
+ spinOnce();
+ if (hardware_.time() > end_time) return false;
+ }
+ return true;
+ }
+
+ public:
+ bool getParam(const char* name, int* param, int length =1){
+ if (requestParam(name) ){
+ if (length == req_param_resp.ints_length){
+ //copy it over
+ for(int i=0; i<length; i++)
+ param[i] = req_param_resp.ints[i];
+ return true;
+ }
+ }
+ return false;
+ }
+ bool getParam(const char* name, float* param, int length=1){
+ if (requestParam(name) ){
+ if (length == req_param_resp.floats_length){
+ //copy it over
+ for(int i=0; i<length; i++)
+ param[i] = req_param_resp.floats[i];
+ return true;
+ }
+ }
+ return false;
+ }
+ bool getParam(const char* name, char** param, int length=1){
+ if (requestParam(name) ){
+ if (length == req_param_resp.strings_length){
+ //copy it over
+ for(int i=0; i<length; i++)
+ strcpy(param[i],req_param_resp.strings[i]);
+ return true;
+ }
+ }
+ return false;
+ }
+ };
+
+}
+
+#endif