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• Error Code: 2013. Lost connection to MySQL server during query
• Error Code: 2006. MySQL server has gone away
• Error Code: 2003. Lost connection to backend server
• The error code reported for MySQL server wait timeouts has been changed from 2006 to 4031 for MySQL server versions 8.0.24 and above.

Set global timeout:

mysql> SET GLOBAL wait_timeout=10;

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Links

Available Methods

Send message

1. Open https://telegram.me/botfather and create bot
2. Get messages from your bot: https://api.telegram.org/bot<Bot_token>/getUpdates
3. Get chat id from response result.$.message.chat.id
4. Send message to bot: https://api.telegram.org/bot<Bot_token>/sendMessage?chat_id=<chat_id>&text=hello

Message with buttons:

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<?php

declare(strict_types=1);

use Rector\Config\RectorConfig;
use Rector\Php55\Rector\Class_\ClassConstantToSelfClassRector;
use Rector\Php70\Rector\FuncCall\MultiDirnameRector;
use Rector\Php70\Rector\StmtsAwareInterface\IfIssetToCoalescingRector;
use Rector\Php70\Rector\Ternary\TernaryToNullCoalescingRector;
use Rector\Php71\Rector\List_\ListToArrayDestructRector;

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Command to create hex file:

xxd -i wallpaper.jpeg > wallpaper.h

Example:

extern const unsigned char wallpaper[];

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#include <cstdint>
#include <cstdio>

#define RUSH_REFERENCE_FREQ 50 // MHz
#define RUSH_INTERMEDIATE_FREQ 480 // MHz
#define RUSH_R_DIVIDER 1
#define RUSH_MOD 65536
#define RUSH_R_OUT_DIVIDER 1
#define FPFD (RUSH_REFERENCE_FREQ / RUSH_R_DIVIDER)

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# get valid mapping and fix it
GET /test.activity_log_v1

# create new indewx with fixed mapping
PUT /test.activity_log_v2/ 
{
  "mappings": {
      "properties": {
        "action": {
          "type": "keyword"

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<?php

$pattern = "| %12s | %12s | %12s | %-8s | %16s | %16s | %18s | %19s | \n";

echo sprintf(
    $pattern,
    'regPaConfig',
    'regPaConfig',
    'ELRS Power',
    'paSelect',

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Difference

MySQL converts TIMESTAMP values from the current time zone to UTC for storage, and back from UTC to the current time zone for retrieval. This does not occur for other types such as DATETIME.

if server timezone changed, values of timestamp will be valid, because it stored as UTC, but values of datetime will change.

Timestamp

Timestamp stores values from 1970-01-01 00:00:00 UTC.

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Compile

Compile locally

make arm_sdk_install

Compile using Docker

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# Set new
curl -XPUT --unix-socket /var/run/control.unit.sock http://localhost/config/applications/app/processes -d 100

# Read current
curl --unix-socket /var/run/control.unit.sock http://localhost/config/applications/app/processes