ERROR:can.socketcan.ctypes:Setting filters failed -1 Find out the can error frame

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• Iterating through Pandas data series

  Here is my code;

  I have a csv file (excel sheet) with dates, lats, and longs. I also have a column with the days as the day-of-the-year index (integers between 0 and 360). I want to loop through the rows (by using an index) and print out the erc variable corresponding to the date, lat and lon. When I do this I get the IndexError listed below... what do I need to correct?

      from netCDF4 import Dataset
      import numpy as np
      import pandas as pd
  
  
      data = pd.read_csv('Lindley.csv')
      print(data.head(5))
  
      POIlat = data.Lat
      POIlon = data.Long
      name = data.Date
      date = data.DayIndex
  
      nc = Dataset('erc_2019.nc')
      print(nc)
  
      lat = nc.variables['lat'][:]
      lon = nc.variables['lon'][:]
      erc = nc.variables['energy_release_component-g'][:]
      #print(nc.variables)
  
      x, y = np.meshgrid(lon, lat)
  
      for i in range(len(POIlat)):
           print(erc[date[i], POIlat[i], POIlon[i]])
  

  IndexError: only integers, slices (:), ellipsis (...), numpy.newaxis (None) and integer or boolean arrays are valid indices
• Altair plot, show vertical bars

  import pandas as pd
  import altair as alt
  dicta = {
      'date':['2019-06-29', '2019-06-30', '2019-07-01', '2019-07-02', '2019-07-03'],
      'amount':[-9.35, -6.42, -13.55, -12.88, -12.24] }
  dataset = pd.DataFrame(dicta)
  alt.Chart(dataset).mark_bar().encode(
      x = "date:T",
      y = "amount:N"    
  )
  

  I'm not sure why this generates horizontal bars, instead of vertical bars by default. How can I change it? I would like to see a bar per day, up to the amount for the day.
• Sympy parse_expr with variables and == returning False

  I'm trying to parse some basic user entered boolean expressions containing symbols that will be filled in later. I'm parsing to gather the symbols and make sure the logic is valid (ie, matched braces, double equal vs single, etc). I'm having trouble with expressions that contain equal checks. Short of pre-parsing to remove them, is there any way to keep sympy from returning False?'

  from sympy.parsing.sympy_parser import parse_expr
  print(parse_expr('foo < 0', evaluate=False))
  print(parse_expr('(foo < 0) & (foo > bar)', evaluate=False))
  print(parse_expr('(foo < 0) & (foo > bar) & (baz == 0)', evaluate=False))
  

  Results

  foo < 0
  (foo > bar) & (foo < 0)  ...reordered, but intact
  False  ...including the == check caused the whole symbolic expression to be lost
  
• How to get the address and port number from text field then connect

  I am creating a client chat GUI that will connect to a server. I am extracting the address and port number from the text field but it dosen't work. Here's my function that I use to connect:

  def tryToConnect():
  # we need to modify the following global variables
  global g_bConnected
  global g_sock
  
  g_sock = socket.socket(family=socket.AF_INET, type=socket.SOCK_STREAM)
  
  if g_sock != None:
      g_sock.settimeout(0.1)
  
      try:
          ipPort = g_app.ipPort.get()
          g_sock.connect((ipPort))
          g_bConnected = True
          printToMessages("Successfully connected!")
          g_app.connectButton['text'] = 'disconnect'
  
      except:
          printToMessages("Unable to connect!")
  

  The g_app.ipPort.get() extracts the text that the user enters, for example: 127.0.0.1:8080. Iv'e tried to just enter g_sock.connect(('127.0.0.1', 8080)) and it works, but not when I try to extract it this way, why is that?
• Can not receive UDP response from the server at an external network

  I have the following scenario.

  "HOST A" a client that sends to a server "HOST B".

  "HOST B" has the port forwarded to the application(as a serer) and all messages from the client are received.

  "HOST A" -> request to server -> "HOST B" //received

  "HOST B" -> response to client -> "HOST A" //Not received

  From my understanding to NAT the client's router creates a mapping for the client as the message is being sent to the server. However, what I am not understanding is why the client is not receiving the reponse message.

  I am using java Datagram sockets to for this program.

  Thanks in advance.
• socket io with react: emit from server to specific user

  I am working on a real-time private chat, using express, socket.io, react. I want to emit a new message from the client, receive it on the server, then resend it to the right receiver using the socket id.

  let users = [];
  io.on("connection", socket => {
    socket.on("login", user => {
      if (user && users.findIndex(x => x.id === user) === -1) {
        socket.userId = user;
        users.push({ socket: socket.id, id: user, notifications: 0 });
      }
      socket.emit("login", { users });
    });
  
    socket.on("newMessage", data => {
      console.log("new msg received: ", data);
      users.find(x => {
        if (x.id === data.receiver) {
          socket.to(x.socket).emit("newMessage", data);
        }
      });
    });
  }
  

  and in the client:

  socket.on("newMessage", data => {
      console.log("new message received to client", data);
    });
  

  but I didn't receive anything on the client, I can't figure out why. NB: I am using functional components.
• Code works line-by-line in command prompt, but new problem appears when I run the file as a whole

  I've just copied out the code used in a Python web scraping guide, and everything works fine when I test each line in the command prompt.

  When I run the whole file, however I get the message:
  
  'File "web_scrape_practice.py", line 23, in "module"
  shipping = shipping_container[0].text.strip()
  IndexError: list index out of range'
  

  This is my code:

  from bs4 import BeautifulSoup as soup
  
  my_url = "https://www.newegg.com/p/pl?d=graphics+cards"
  
  uReq(my_url)
  uClient = uReq(my_url)
  page_html = uClient.read()
  uClient.close()
  
  page_soup = soup(page_html, "html.parser")
  containers = page_soup.findAll("div", {"class": "item-container"})
  container = containers[4]
  brandDiv = container.find("div","item-info")
  
  for container in containers:
      brand = brandDiv.div.img["title"]
  
      title_container = container.findAll("a", {"class":"item-title"})
      product_name = title_container[0].text
  
      shipping_container = container.findAll("li", {"class":"price-ship"})
      shipping = shipping_container[0].text.strip()
  
  
      print("brand: " + brand)
      print("product_name: " + product_name)
      print("shipping: " + shipping)<br><br>
  

  line 23 is this one:
  
  shipping = shipping_container[0].text.strip()

  Any help appreciated.
• Not allowed to insert information into database

  I'm trying to insert from data into my database but it won't work for some reason. I keep getting the following error when submitting the form: Error: INSERT INTO voorwerpen (beschrijving, waar, wanneer, ophalen) VALUES ('example', 'example', 'example', 'example')* Access denied for user 'id11830342_profielwerkstuk'@'%' to database 'voorwerpen'. I'm using the database i got through 000webhosting. When i leave out the $sql part it says my connection is fine so i'm assuming the error has something to do with my sql.Thanks in advance.

  <meta charset = "utf-8">
  <head>
  <link rel="stylesheet" href="profielwerkstukSTYLE.css">
  <ul>
    <li><a href="index.html">Home</a></li>
    <li><a class="active" href="upload.php">upload voorwerp</a></li>
    <li><a href="voorwerpenlijst.html">voorwerp lijst</a></li>
  </ul>
  </head>
  <body>
  <h3>Upload het door u gevonden voorwerp<h3><br>
  <div>
  <form action="upload.php" method="post" enctype="multipart/form-data">
  Beschrijving:<br>   <input type="text" name="beschrijving" placeholder="bijv. jas, airpods, sleutels etc."><br>
  Waar:<br>           <input type="text" name="waar" placeholder="bijv. lokaal 117"><br>
  Wanneer:<br>        <input type="text" name="wanneer" placeholder="bijv. 5e uur"><br>
  ophalen waar:<br>   <input type="text" name="ophalen" placeholder="bijv. bij de balie"><br>
  <input type="submit" value="verzend" name="knop">
  </form>
  <div>
  
  <?php
  if(
  isset($_POST["beschrijving"])&& $_POST["beschrijving"]!="" &&
  isset($_POST["waar"]) && $_POST["waar"]!="" &&
  isset($_POST["wanneer"]) && $_POST["wanneer"]!="" &&
  isset($_POST["ophalen"]) && $_POST["ophalen"]!="")
  
  
  {
  $host="localhost";
  $username="id11830342_profielwerkstuk";
  $password="12345";
  $dbname="voorwerpen";
  
  $conn= mysqli_connect("$host", "$username", "$password", "$dbname");
  
  if (!$conn) {
      die("Connection failed: " . mysqli_connect_error());
  }
  
  $beschrijving=$_POST["beschrijving"];
  $waar=$_POST["waar"];
  $wanneer=$_POST["wanneer"];
  $ophalen=$_POST["ophalen"];
  
  $sql = "INSERT INTO voorwerpen (beschrijving, waar, wanneer, ophalen)
  VALUES ('$beschrijving', '$waar', '$wanneer', '$ophalen')";
  
  if (mysqli_query($conn, $sql)) {
      echo "New record created successfully";
  } else {
      echo "Error: " . $sql . "<br>" . mysqli_error($conn);
  }
  
  mysqli_close($conn);
  }
  else
  {
  if(isset($_POST["knop"]))
  {
      print("Vul A.U.B alles in");
  }   
  }
  
  ?>
  </body>
  </html>```
  
  
  
• What is wrong in this async call?

  In this code, function A() calls B(). It works well but sometimes cause an error.

  function A() {
   //some codes here
   (async () => {
          var v1 = await B();
          var v2 = await v1.json();
          //some codes here
   )}()
  //some codes here
  

  and here is the function B()

  async function B() {
      return await fetch('https://api.myip.com/');
  }
  

  Please suggest on what is wrong with my code? Thanks in advance.
• Get JavaScript timezone string with DST settings

  Context

  I'm running a web server on a ESP8266 and would like to implement automatic DST on the device. At the moment I'm getting the time settings from the client. I'm using ESP8266 SDK and not Arduino.

  Question

  Is there a way to get the DST settings from a client in the following format using JavaScript?

  std offset dst [offset],start[/time],end[/time]

  I can get the timezone string using:

  Intl.DateTimeFormat().resolvedOptions().timeZone
  

  The current system I'm working on does not have support for the format.

  :characters

  Witch is the format that the above JavaScript returns. If I'm not mistaken.

  Code

  time_t now =0;
  struct tm timeinfo;
  setenv("TZ","IST-2IDT,M3.5.5/2,M10.5.0/2", 1);
  tzset();
  
  timeinfo.tm_sec =   sec;
  timeinfo.tm_min =   min;
  timeinfo.tm_hour =  hour;
  timeinfo.tm_mday =  date;
  timeinfo.tm_mon =   mon;
  timeinfo.tm_year =  year + 100;
  timeinfo.tm_wday =  weekd;
  
  //set the time manually
  now = mktime(&timeinfo);
  
  if(now < 0){
   //handle error
   ESP_LOGE(__func__, "Time error");
  
  }else{
   localtime_r(&now, &timeinfo);
   //print tm_isdst value
   ESP_LOGW(__func__, "DST is active %d",timeinfo.tm_isdst);
  
   char strftime_buf[64];
   strftime(strftime_buf, sizeof(strftime_buf), "%c", &timeinfo);
   //print time str
   ESP_LOGI(__func__, "The current date/time: %s", strftime_buf);
  }
  

  Problem

  If I set the TZ veriable with IST-2IDT,M3.5.5/2,M10.5.0/2 the timeinfo.tm_isdst variable changes on the expected dates and times. If I set TZ with Asia/Jerusalem the timeinfo.tm_isdst variable simply stays at 0. Also tested with America/New_York with the same result.

  Reference

  TZ-Variable
• UART on STM32f767zi Nucleo Board

  I wrote this code for UART driver for STM32f767zi and i can't figure out why this is not working.

  From the datasheet and Reference manual i saw

  USART2 is connected to APB1 bus

  In RCC_APB1 Enable Register bit 17 is for UART2

  Port A Pin 2 (PA2) can be configured as UART TX

  #include "stm32f7xx.h"
  
  void USART2_Init(void);
  void USART_write(int ch);
  void delayms(int delay);
  
  int main(void){
  
      USART2_Init();
  
      while(1){
          USART_write('H');
          USART_write('i');
          delayms(10);
      }   
  }
  
  void USART2_Init(void){
  
      RCC->APB1ENR |= 0x20000;        // Enables clock access to USART2
      RCC->AHB1ENR |= 1;              // Enables clock access to GPIOA
  
      GPIOA->AFR[0] = 0x0700;         // Enabling USART2 PA2 AF7
      GPIOA->MODER |= 0x0020;         // PA2 <-> Alternate function
  
      USART2->BRR = 0x0683;           // 9600 @16 MHz
      USART2->CR1 = 0x0008;           // Enable Tx
      USART2->CR1 |= 1;               // Enable USART 
  
  }
  
  void USART_write(int ch){
      // wait while TX buffer is empty
      while(!(USART2->ISR & 0x0080)){}
          USART2->TDR = (ch & 0xFF);
  }
  
  void delayms(int delay){
      int i;
      for(; delay>0; delay--){
          for(i=0;i<3195;i++);
      }
  }
  

  Can't see the printed 'Hi' on TeraTerm
• How to use a microcontroller that has no RAM?

  Some microcontrollers (such as the ATtiny12) have no SRAM at all. How is it even possible to get them to do anything useful? And why would anyone make such a limited device?

  The only way I can think of to program a chip with no RAM is using some kind of primitive state machine, where the current value of the program counter essentially defines the state. For example:

  Do
    Wait for button press
    Illuminate the LED
    Wait for button release
    Extinguish the LED
  Loop
  

  I'm not trying to solve a specific problem, I'm just curious. Can anything more complicated be achieved without memory? I've tried googling, with no useful results.

  Am I missing something here?
• Driver error 11 in TransmitCANFrame XL_ERR_QUEUE_IS_FULL

  I am using a CANCase VN1640A between 2 ECUs in order to falsify a CAN message. Below the bridge simulation setup:

  

  In my CAPL Code, the received messages from channel 1 will be redirected to channel 3 and vice-versa. (So far I am not falsifying any message)

  variables{
  message can1. msgCAN1;
  message can3. msgCAN3;
  }
  
  on message can1.{
   msgCAN3=this;
  
   if(this.dir == rx)
   output(msgCAN3);
  }
  
  on message can3.{
   msgCAN1 = this;
  
   if(this.dir == rx)
   output(msgCAN1);
  }
  

  But when I start CANoe I get this Error message:

  

  This error means that CANoe tries to send more as it could. The transmit buffer is overflowed. I have changed the hardware configuration of Transmit Queue size to the max 32768 messages, also the Receive Latency to very fast but unfortunately the error occur again.

  Does anyone have any hints that could help to solve this problem and thanks in advance.
• CAN BUS - ACK field (singular or multiple response?)

  I have several ECAN within the PIC18 and PIC24 (on OpenCan) with Can Transceiver attached to the CAN Bus network. In event one module send a message and received by other modules (within ECAN), will all ECAN do CRC check and if passed, make dominate bit or just one one of many make this response?. In other words, does PIC ECAN make ACK response even the message is not assigned for that module?
• Automatic Node ID assignment for LSS Slaves without LSS Master

  I am currently doing a system design with CANopen communication and I am curious about the following question.

  In the system a device is programmed to have no Node-Id assigned (255) on startup. Normaly a LSS Master now has to assign a specific Node-Id to the device to work properly. However, if there is no LSS Master functionality implemented in any other bus node, does the CANopen standard allows the the unconfigured device to assign itself a predefined ID after a timeout?

  In my opinion this is not possible because it can lead to undefined system states but I could not find anything in the standard documents.