The JSZip documentation doesn’t make it entirely clear how to include it in the browser, i.e. which <script> tag you need to use in order to load JSZip.
Here’s the appropriate <script> tag:
<script src="https://unpkg.com/[email protected]/dist/jszip.min.js" type="text/javascript"></script>
You can also use the non-minified version which does not have minified class and object names:
<script src="https://unpkg.com/[email protected]/dist/jszip.js" type="text/javascript"></script>
In our previous post How to load local file in Javascript using HTML5 FileReader we showed how to read a local file using the HTML5 FileReader.
Based on this, it’s pretty easy to use JSZip to read a local ZIP file:
var reader = new FileReader();
reader.onload = function(ev) {
JSZip.loadAsync(ev.target.result).then(function(zip) {
// TODO Your code goes here. This is just an example.
console.log(zip)
}).catch(function(err) {
console.error("Failed to open", filename, " as ZIP file:", err);
})
};
reader.onerror = function(err) {
console.error("Failed to read file", err);
}
reader.readAsArrayBuffer(fileInput.files[0]);One example of what you can do using the JSZip object is to list the filenames inside the ZIP file:
var filename = fileInput.files[0].name;
var reader = new FileReader();
reader.onload = function(ev) {
JSZip.loadAsync(ev.target.result).then(function(zip) {
for(let [filename, file] of Object.entries(zip.files)) {
console.log(filename);
}
}).catch(function(err) {
console.error("Failed to open", filename, " as ZIP file:", err);
})
};
reader.onerror = function(err) {
console.error("Failed to read file", err);
}
reader.readAsArrayBuffer(fileInput.files[0]);<html>
<body>
<input type="file" id="myfile" onchange="onMyfileChange(this)" />
<script src="https://unpkg.com/[email protected]/dist/jszip.js" type="text/javascript"></script>
<script type="text/javascript">
function onMyfileChange(fileInput) {
if(fileInput.files[0] == undefined) {
return ;
}
var filename = fileInput.files[0].name;
// var filesize = fileInput.files[0].size;
var reader = new FileReader();
reader.onload = function(ev) {
JSZip.loadAsync(ev.target.result).then(function(zip) {
console.log(zip)
}).catch(function(err) {
console.error("Failed to open", filename, " as ZIP file");
})
};
reader.onerror = function(err) {
console.error("Failed to read file", err);
}
reader.readAsArrayBuffer(fileInput.files[0]);
}
</script>
</body>
</html>
In HTML5, you can not only upload a file to a server but also process it directly in the browser using Javascript.
This post provides minimal examples of how to use FileReader to do that.
<html>
<body>
<input type="file" id="myfile" onchange="onMyfileChange(this)" />
<script type="text/javascript">
function onMyfileChange(fileInput) {
if(fileInput.files[0] == undefined) {
return ;
}
// Example of what information you can read
// var filename = fileInput.files[0].name;
// var filesize = fileInput.files[0].size;
var reader = new FileReader();
reader.onload = function(ev) {
var content = ev.target.result; // content is a string
console.log("Successfully read file");
};
reader.onerror = function(err) {
console.error("Failed to read file", err);
}
reader.readAsText(fileInput.files[0]);
}
</script>
</body>
</html><html>
<body>
<input type="file" id="myfile" onchange="onMyfileChange(this)" />
<script type="text/javascript">
function onMyfileChange(fileInput) {
if(fileInput.files[0] == undefined) {
return ;
}
// Example of what information you can read
// var filename = fileInput.files[0].name;
// var filesize = fileInput.files[0].size;
var reader = new FileReader();
reader.onload = function(ev) {
var content = ev.target.result; // content is an ArrayBuffer object
console.log("Successfully read file");
};
reader.onerror = function(err) {
console.error("Failed to read file", err);
}
reader.readAsArrayBuffer(fileInput.files[0]);
}
</script>
</body>
</html>
In Linux, my USB 3.0 hub randomly kept resetting and only recovered after a reboot: All USB devices were offline until I manually rebooted the system. This is the dmesg output:
[ 3685.684555] xhci_hcd 0000:04:00.0: Abort failed to stop command ring: -110 [ 3685.716572] xhci_hcd 0000:04:00.0: Host halt failed, -110 [ 3685.716575] xhci_hcd 0000:04:00.0: xHCI host controller not responding, assume dead [ 3685.716620] xhci_hcd 0000:04:00.0: HC died; cleaning up [ 3685.716653] xhci_hcd 0000:04:00.0: Timeout while waiting for setup device command [ 3685.716820] usb 3-2: USB disconnect, device number 3 [ 3685.716942] usb 4-2: USB disconnect, device number 2 [ 3685.716944] usb 4-2.4: USB disconnect, device number 3 [ 3686.268612] usb 3-2.3: device not accepting address 29, error -22 [ 3686.268694] usb 3-2.3: USB disconnect, device number 29 [ 3686.269109] usb 3-2.4: USB disconnect, device number 4 [ 3686.269114] usb 3-2.4.1: USB disconnect, device number 5 [ 3686.345109] usb 3-2.4.2: USB disconnect, device number 9 [ 3686.573230] usb 3-2.4.3: USB disconnect, device number 7 [ 3686.701272] usb 3-2.4.4: USB disconnect, device number 8
I discovered the solution (which basically restarts the xHCI USB device) on the ArchLinux forums:
echo -n "0000:04:00.0" > /sys/bus/pci/drivers/xhci_hcd/unbind echo -n "0000:04:00.0" > /sys/bus/pci/drivers/xhci_hcd/bind
You need to insert your device ID which you can find in the dmesg output (0000:04:00.0 in my case) and run the code as root.
When running bup fuse, you see this error message
error: cannot find the python "fuse" module; please install it
On Ubuntu or other debian-based systems, just install the package using apt:
sudo apt -y install python3-fuse
Otherwise, install it using pip:
sudo pip3 install fuse-python
In Marlin, you can dynamically configure the stepper motor current for Trinamic stepper drivers like the TMC2208 or the TMC5160.
The easiest option is by using G-Codes. In order to set the stepper motor current for X , Y and Z to 2 Amperes (2000 mA), use M906 like this:
M906X2000Y2000Z2000
Now save the settings to the EEPROM using
M500
You can also query the current stepper motor current using
M906 X driver current: 2000 Y driver current: 2000 Z driver current: 2000 E driver current: 800 ok
You can also set default stepper motor current values in the Marlin config files. Note that these will be overridden by any value in the EEPROM.
In Configuration_adv.h, look for
#if HAS_TRINAMIC_CONFIG
which contains axis definitions like
#if AXIS_IS_TMC(X) #define X_CURRENT 800 // (mA) RMS current. Multiply by 1.414 for peak current. #define X_CURRENT_HOME X_CURRENT // (mA) RMS current for sensorless homing #define X_MICROSTEPS 32 // 0..256 #define X_RSENSE 0.11 #define X_CHAIN_POS -1 // -1..0: Not chained. 1: MCU MOSI connected. 2: Next in chain, ... //#define X_INTERPOLATE true // Enable to override 'INTERPOLATE' for the X axis #endif
Change the value in the line
#define X_CURRENT 800 // (mA) RMS current. Multiply by 1.414 for peak current.
so, for example to set 2A (2000 mA), set it to
#define X_CURRENT 2000 // (mA) RMS current. Multiply by 1.414 for peak current.
This example sends the M119 (print endstop status) command to an attached 3D printer and prints the response in a loop
#!/usr/bin/env python3
import serial
ser = serial.Serial("/dev/ttyACM0")
try:
while True:
ser.write(b"M119\n")
response = ser.read_until(b"ok\n")
print(response.decode("utf-8"))
finally:
ser.close()Example output (in a loop):
Reporting endstop status x_max: open y_max: TRIGGERED z_max: TRIGGERED ok
By default, the Raspberry Pi 4 USB-C port is not set to Host mode and therefore it’s not possible.
In order to set the USB-C port to host mode, add the following line to the end of /boot/config.txt (in the [all] section):
dtoverlay=dwc2,dr_mode=host
and
reboot
The following script backups your Let’s Encrypt folder. I place the script in /etc/letsencrypt/backup.sh
#!/bin/bash export BUP_DIR=/media/usb1/letsencrypt-myserver.bup # Init bup -d $BUP_DIR init # Save LetsEncrypt directory bup -d $BUP_DIR index . --exclude csr && bup save -9 --strip-path $(pwd) -n etc-letsencrypt . # OPTIONAL: Add par2 information # This is only recommended for backup on unreliable storage or for extremely critical backups # If you already have bitrot protection (like BTRFS with regular scrubbing), this might be overkill. # Uncomment this line to enable: # bup fsck -g # OPTIONAL: Cleanup old backups bup -d $BUP_DIR prune-older --keep-all-for 1m --keep-dailies-for 6m --keep-monthlies-for forever -9 --unsafe
Typically, you only need to adjust the BUP directory in this line:
export BUP_DIR=/media/usb1/letsencrypt-myserver.bup
In order to automatically backup daily, you can use our script from How to create a systemd backup timer & service in 10 seconds. If you don’t want to read the post, just use this command:
wget -qO- https://techoverflow.net/scripts/create-backup-service.sh | sudo bash /dev/stdin
from the /etc/letsencrypt folder.
Just want to know how many active calls are going on and not interested in the details? See How to view number of active calls on FreePBX
In order to view the details of ongoing calls on FreePBX, go to Admin -> Asterisk CLI
and enter
core show channels verbose
Now click Send command on the right:
This will display, for example
Channel Context Extension Prio State Application Data CallerID Duration Accountcode PeerAccount BridgeID PJSIP/MyTrunk-4924 from-sip-external 1 Up AppDial (Outgoing Line) 015212345678 00:00:28 4e5accae-8a9c-48bb-b PJSIP/123-0000000e macro-dialout-trunk s 27 Up Dial PJSIP/01521234567@MyTrunk 492468024123 00:00:28 4e5accae-8a9c-48bb-b 2 active channels 1 active call 8 calls processed
In the example shown, a PJSIP client (phone) registered as extension 123, calls out on a PJSIP trunk line named MyTrunk-492468024123, calling the PSTN number 015212345678.
Also want to see call details like which extension is calling which number, call duration and which trunks are being used? See How to view active calls details on FreePBX instead.
In order to view how many calls are active concurrently on FreePBX, go to Admin -> Asterisk CLI
and enter
core show calls
Now click Send command on the right:
This will display, for example
1 active call 6 calls processed
indicating that one call is currently going on.
If no calls are currently in process, it will display
0 active calls 6 calls processed
You can use access_by_lua_block in order to replace arbitrary strings in an nginx request. Note: This will replace in the request to the reverse proxy, not in the response from the reverse proxy. See How to replace HTTP response data in nginx using lua for a Lua-based approach on how to replace a string in the response.
access_by_lua_block {
ngx.req.read_body()
local body = ngx.req.get_body_data()
if body then
body = ngx.re.gsub(body, "string_to_replace", "string_by_which_to_replace")
end
ngx.req.set_body_data(body)
}This is typically used in a location {} block so you can just replace when a specific set of URLs is accessed:
location /config {
proxy_pass http://127.0.0.1:12345/;
proxy_set_header X-Forwarded-For $remote_addr;
access_by_lua_block {
ngx.req.read_body()
local body = ngx.req.get_body_data()
if body then
body = ngx.re.gsub(body, "myvar", "myothervar")
end
ngx.req.set_body_data(body)
}
}
This is an example of how to use body_filter_by_lua_block to replace parts of the response by a string. Note that since it’s a Lua feature, you’ll be able to use arbitrary code when modifying the body, including network requests, parsing etc. Note: This will replace in the response send to the client, not in the request sent to the the reverse proxy. See How to replace string in reverse proxy HTTP request using Lua & nginx for a Lua-based approach on how to replace a string in the request.
header_filter_by_lua_block { ngx.header.content_length = nil }
body_filter_by_lua_block {
local body = ngx.arg[1]
if body then
body = ngx.re.gsub(body, "string_to_replace", "string_by_which_to_replace")
end
ngx.arg[1] = body
}
This is typically used in a location {} block to only replace strings for specific sets of URLs:
location /config {
proxy_pass http://127.0.0.1:12345/;
proxy_set_header X-Forwarded-For $remote_addr;
proxy_set_header Host meet.techoverflow.net;
header_filter_by_lua_block { ngx.header.content_length = nil }
body_filter_by_lua_block {
local body = ngx.arg[1]
if body then
body = ngx.re.gsub(body, "myvar", "myothervar")
end
ngx.arg[1] = body
}
}
When running a Python script, you see an error message like
Traceback (most recent call last):
File "./dfuse-tool.py", line 2, in <module>
import dfuse
File "/home/uli/dev/tools/dfuse-tool/dfuse/__init__.py", line 1, in <module>
from dfuse.DfuDevice import DfuDevice
File "/home/uli/dev/tools/dfuse-tool/dfuse/DfuDevice.py", line 1, in <module>
import usb.util
ModuleNotFoundError: No module named 'usb'
You need to install PyUSB using
sudo pip3 install pyusb
On 3D printer mainboards running the Marlin firmware, you can use M119 to view the current state of the endstops. Example output:
M119 Reporting endstop status x_max: TRIGGERED y_max: TRIGGERED z_min: TRIGGERED ok
The Marlin 3d printer firmware allows you to print the firmware version (along with different firmware settings) using the M115 command. The M115 command takes no parameters.
Example output:
M115 FIRMWARE_NAME:Marlin bugfix-2.0.x (May 13 2021 14:16:08) SOURCE_CODE_URL:github.com/MarlinFirmware/Marlin PROTOCOL_VERSION:1.0 MACHINE_TYPE:OCTOPUS_V1_0 EXTRUDER_COUNT:4 UUID:cede2a2f-41a2-4748-9b12-c55c62f367ff Cap:SERIAL_XON_XOFF:0 Cap:BINARY_FILE_TRANSFER:0 Cap:EEPROM:1 Cap:VOLUMETRIC:1 Cap:AUTOREPORT_TEMP:1 Cap:PROGRESS:0 Cap:PRINT_JOB:1 Cap:AUTOLEVEL:0 Cap:RUNOUT:0 Cap:Z_PROBE:0 Cap:LEVELING_DATA:0 Cap:BUILD_PERCENT:0 Cap:SOFTWARE_POWER:0 Cap:TOGGLE_LIGHTS:0 Cap:CASE_LIGHT_BRIGHTNESS:0 Cap:EMERGENCY_PARSER:1 Cap:PROMPT_SUPPORT:0 Cap:SDCARD:1 Cap:REPEAT:0 Cap:SD_WRITE:1 Cap:AUTOREPORT_SD_STATUS:0 Cap:LONG_FILENAME:1 Cap:THERMAL_PROTECTION:1 Cap:MOTION_MODES:0 Cap:ARCS:1 Cap:BABYSTEPPING:0 Cap:CHAMBER_TEMPERATURE:0 Cap:COOLER_TEMPERATURE:0 Cap:MEATPACK:0 ok
When building Marlin firmware for the BigTreeTech Octopus from the official BigTreeTech GitHub repository Marlin directory, you can see two different targets in PlatformIO:
It is not immediately made clear what the difference between those is, but a short description can be found in ini/stm32f4.ini:
BIGTREE_OCTOPUS_V1_USB has support for using USB flashdrives directly on the board and serial-over-USB while BIGTREE_OCTOPUS_V1 has not.
BIGTREE_OCTOPUS_V1_USB if printing via USB (e.g. via Octoprint) because the BIGTREE_OCTOPUS_V1 configuration does not allow printing via USB.BIGTREE_OCTOPUS_V1 in ini/stm32f4.ini are:build_flags = ${stm32_variant.build_flags}
-DSTM32F446_5VX -DUSE_USB_HS_IN_FSwhereas BIGTREE_OCTOPUS_V1_USB enabled more USB-related features:
build_flags = ${stm_flash_drive.build_flags}
-DSTM32F446_5VX -DUSE_USB_HS_IN_FS
-DUSE_USBHOST_HS -DUSBD_IRQ_PRIO=5
-DUSBD_IRQ_SUBPRIO=6
-DUSBD_USE_CDC_MSCI tried to flash the DFU bootloader on the BigTreeTech Octopus V1 3D printer mainboard. However, STM32CubeProgrammer v2.8.0 showed me the following error message when trying to connect:
CUBEPROGRAMMER_ERROR_NOT_SUPPORTED
I could only fix this by completely uninstalling STM32CubeProgrammer and then installing STM32CubeProgrammer v2.7.0 from the BigTreeTech Github Repo. Most likely downloading v2.7.0 from the ST homepage will also work but I didn’t verify this.
Run this command to create a debug profile from your default profile:
cp ~/.conan/profiles/default ~/.conan/profiles/debug && sed -i -e 's/Release/Debug/g' ~/.conan/profiles/debug
Example output from conan profile show debug:
[settings] os=Linux os_build=Linux arch=x86_64 arch_build=x86_64 compiler=gcc compiler.version=9 compiler.libcxx=libstdc++ build_type=Debug [options] [conf] [build_requires] [env]
Use this snippet using chrono:
#include <chrono>
uint64_t timeSinceEpochMilliseconds = std::chrono::duration_cast<std::chrono::milliseconds>(
std::chrono::system_clock::now().time_since_epoch()
).count();