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xbee split and merge messages

This commit is contained in:
vivek-shankar 2017-01-25 22:42:32 -05:00
parent 627018760f
commit 249fbd7f1d
2 changed files with 160 additions and 15 deletions
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2
include/CommunicationManager.h
View File

@ -80,7 +80,7 @@ private:
bool Serve_Flight_Controller(mavros_msgs::CommandInt::
Request& request, mavros_msgs::CommandInt::Response& response);
void Check_In_Messages_and_Transfer_To_Server();
unsigned short Caculate_Checksum(std::string* frame);
Mist::Xbee::SerialDevice serial_device_;
Thread_Safe_Deque* in_messages_;
ros::NodeHandle node_handle_;

173
src/CommunicationManager.cpp
View File

@ -9,6 +9,19 @@
#include "CommunicationManager.h"
uint16_t* u64_cvt_u16(uint64_t u64){
uint16_t* out = new uint16_t[4];
uint32_t int32_1 = u64 & 0xFFFFFFFF;
uint32_t int32_2 = (u64 & 0xFFFFFFFF00000000 ) >> 32;
out[0] = int32_1 & 0xFFFF;
out[1] = (int32_1 & (0xFFFF0000) ) >> 16;
out[2] = int32_2 & 0xFFFF;
out[3] = (int32_2 & (0xFFFF0000) ) >> 16;
//cout << " values " <<out[0] <<" "<<out[1] <<" "<<out[2] <<" "<<out[3] <<" ";
return out;
}
namespace Mist
{
@ -294,6 +307,22 @@ inline void CommunicationManager::Calculate_and_Append_Checksum(
frame->push_back(checksum_byte);
}
unsigned short CommunicationManager::Caculate_Checksum(std::string* frame)
{
unsigned short bytes_sum = 0;
unsigned lowest_8_bits = 0;
unsigned short checksum = 0;
unsigned char checksum_byte;
for (unsigned short i = 0; i < frame->size(); i++)
bytes_sum += static_cast<unsigned short>(frame->at(i));
lowest_8_bits = bytes_sum & 0xFF;
checksum = 0xFF - lowest_8_bits;
return checksum;
}
//*****************************************************************************
inline void CommunicationManager::Add_Length_and_Start_Delimiter(
@ -323,29 +352,99 @@ inline void CommunicationManager::Add_Length_and_Start_Delimiter(
inline void CommunicationManager::Check_In_Messages_and_Transfer_To_Topics()
{
std::size_t size_in_messages = in_messages_->Get_Size();
uint16_t* header;
if (size_in_messages > 0)
{
uint64_t current_int64 = 0;
uint16_t checksum_cur;
std::vector<uint64_t> msgs;
int cur_pos;
for (std::size_t j = 0; j < size_in_messages; j++)
{
std::shared_ptr<std::string> in_message =
in_messages_->Pop_Front();
mavros_msgs::Mavlink mavlink_msg;
for (std::size_t i = 0; i < in_message->size(); i++)
{
if (' ' == in_message->at(i) || 0 == i)
{
sscanf(in_message->c_str() + i, "%" PRIu64 " ",
//uint64_t header=0;
sscanf(in_message->c_str(), "%" PRIu64 " ",
&current_int64);
mavlink_msg.payload64.push_back(current_int64);
}
}
header = u64_cvt_u16(current_int64);
uint16_t checksum_cur=header[1];
mavlink_publisher_.publish(mavlink_msg);
if(header[3]==1){
for (std::size_t i = 1; i < in_message->size(); i++)
{
if (' ' == in_message->at(i) || 0 == i)
{
sscanf(in_message->c_str() + i, "%" PRIu64 " ",
&current_int64);
mavlink_msg.payload64.push_back(current_int64);
}
}
std::cout << "Single packet message" << std::endl;
mavlink_publisher_.publish(mavlink_msg);
delete[] header;
}
else{
std::cout << "Multi packet message" << std::endl;
if (msgs.size()==0 && header[2]==1){
std::cout << "first message" << std::endl;
checksum_cur=header[1];
cur_pos=header[2]+1;
for (std::size_t i = 1; i < in_message->size(); i++)
{
if (' ' == in_message->at(i) || 0 == i)
{
sscanf(in_message->c_str() + i, "%" PRIu64 " ",
&current_int64);
msgs.push_back(current_int64);
}
}
delete[] header;
}
else if(msgs.size() > 0 && header[1] == checksum_cur && (cur_pos == header[2])){
for (std::size_t i = 1; i < in_message->size(); i++)
{
if (' ' == in_message->at(i) || 0 == i)
{
sscanf(in_message->c_str() + i, "%" PRIu64 " ",
&current_int64);
msgs.push_back(current_int64);
}
}
std::cout << "Correspoding Packet" << std::endl;
cur_pos++;
if(msgs.size()==header[3]){
for (std::size_t i = 0; i < msgs.size(); i++)
{
mavlink_msg.payload64.push_back(msgs[i]);
}
mavlink_publisher_.publish(mavlink_msg);
delete[] header;
msgs.clear();
checksum_cur=0;
cur_pos=0;
std::cout << "Last packet received sucessfully" << std::endl;
}
delete[] header;
}
else {
msgs.clear();
cur_pos=0;
checksum_cur=0;
std::cout << "Wrong ordered message" << std::endl;
delete[] header;
}
}
}
}
@ -398,13 +497,13 @@ inline void CommunicationManager::Send_Mavlink_Message_Callback(
const mavros_msgs::Mavlink::ConstPtr& mavlink_msg)
{
const unsigned short MAX_BUFFER_SIZE = 211; /* 20 (length(uint64_t)) * 10 (max int number) + 10 (spaces) + 1 */
const unsigned short MAX_NBR_OF_INT64 = 10;
const unsigned short MAX_NBR_OF_INT64 = 20;
char temporary_buffer[MAX_BUFFER_SIZE];
std::string frame;
int converted_bytes = 0;
/* Check the payload is not too long. Otherwise ignore it. */
if (mavlink_msg->payload64.size() <= MAX_NBR_OF_INT64)
/* if (mavlink_msg->payload64.size() <= MAX_NBR_OF_INT64)
{
for (unsigned short i = 0; i < mavlink_msg->payload64.size(); i++)
{
@ -417,6 +516,52 @@ inline void CommunicationManager::Send_Mavlink_Message_Callback(
Generate_Transmit_Request_Frame(temporary_buffer, &frame);
serial_device_.Send_Frame(frame);
}
else
{*/
char temporary_buffer_check[6000];
for(int i=0; i<mavlink_msg->payload64.size(); i++)
{
converted_bytes += sprintf(
temporary_buffer_check + converted_bytes, "%" PRIu64 " ",
(uint64_t)mavlink_msg->payload64.at(i));
}
frame.append(temporary_buffer_check, std::strlen(temporary_buffer_check));
uint16_t check_sum = (uint16_t)Caculate_Checksum(&frame);
uint16_t cnt=0;
uint16_t number=1;
uint16_t total =ceil((double)(mavlink_msg->payload64.size()/20));
uint64_t header = 0 | ((uint64_t)check_sum << 16) | ((uint64_t)number << 32) |((uint64_t) total << 48) ;
//temporary_buffer[MAX_BUFFER_SIZE]="";
frame="";
converted_bytes= sprintf(
temporary_buffer, "%" PRIu64 " ",
(uint64_t)header);
for (int i =0; i<mavlink_msg->payload64.size(); i++)
{
if(cnt<20){
converted_bytes += sprintf(
temporary_buffer+converted_bytes, "%" PRIu64 " ",
(uint64_t)mavlink_msg->payload64.at(i));
cnt++;
}
else
{
Generate_Transmit_Request_Frame(temporary_buffer, &frame);
serial_device_.Send_Frame(frame);
number++;
cnt=0;
frame = "";
header = 0 | ((uint64_t)check_sum << 16) | ((uint64_t)number << 32) |((uint64_t) total << 48) ;
memset(temporary_buffer, 0, MAX_BUFFER_SIZE);
converted_bytes = sprintf(
temporary_buffer, "%" PRIu64 " ",
(uint64_t)header);
}
}
//}
}