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Mastering Development

How to get around CORS in React and Electron?

I want to write client for Bakalari API I use this code for login: const uri = "bakalari.example.com/api/login"; const body = User.toURLEncoded(data); // object to url params string const requestOptions = { method: ‘POST’, body, headers: { ‘Content-Type’: ‘application/x-www-form-urlencoded’, Authorization: `Bearer ${this.accessToken}` } }; const response = await got(uri, requestOptions); When I run this in […]

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Ask Electrical Engineering Engineering

3V3 relay control with ESP-01

I am working on a simple circuit whose goal is to control a high voltage device (e.g. a lamp) thanks to a (3V3) relay module, ESP8266-01 and the MQTT protocol. To power this circuit, I am using a 5V phone charger producing a 3.3V voltage through an AMS1117 voltage regulator (5V –> 3V3). This 3V3 […]

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CMS Drupal Mastering Development

How to create a link to start a visit with the “Tour” module?

I created a module to make a visit to my site. I want an ananyme or authenticated user to be able to start the visit by simply clicking on a link. How to create a link to start a visit with the "Tour" module ? Here is my file : langcode: fr status: true id: […]

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Database Development

Bottleneck when inserting many rows into different tables

TLDR: I want to bulk insert into many initially empty tables at once, without the performance of each insert being affected too badly. I seem to be hitting a performance bottleneck I can’t yet explain. I am looking for performance debugging avenues or advice on parallel inserts in Postgres. I am prototyping a system and […]

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Android User Help

No service on Blackview BV 5500 Pro with Lineage 17.1

The issue I installed Lineage OS on my blackview BV 5500 Pro and am facing the "No Service" issue since. There does not seem to be any hardware issue and I’ve exhausted all the options I could think of. Specifications Image installed: lineage-17.1-20201012-UNOFFICIAL-treble_a64_bvS Build number: treble_a64_bvS-userdebug 10 QQ3A.200805.001 eng.crossg.20201012.051017 test-keys Carrier: Ultra mobile Phone: Blackview […]

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Mastering Development

Cannot make my status bar color to match my UINavigationBar color in SiwftUI

My problem appears to be a simple one. But I just spent hours looking for a solution! I just have to make the status bar’s background color conform to my UINavigationBar background’s color (red in this sample). I wrote a minimal code sample to reproduce my problem and help you for giving me a solution… […]

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Database Development

Referencing many tables’ records from one table

Apologies for the title, I am new to DB design and do not know a better way for how to phrase the question. I have multiple tables that represent different resources, e.g. a building (Building(buildingId, …), a floor (Floors(floorId, buildingId, …), a user User(userId, floorId, …), etc. How should I go about creating a resource […]

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Apple User Help

cronjobs do not run

I have recently switched from Ubuntu to MacOS. I tried to run the exact same cronjobs I ran on Ubuntu before, however they don’t, and after trying to figure out if the crontab entries might have any errors, I more and more had the suspicion that cronjobs don’t run on my MBP at all, so […]

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Mastering Development

Reduce number of joins in mysql

I have 12 fixed tables (group, local, element, sub_element, service, …), each table with different numbers of lines. The collums id_ in all table is a primary key (int). The others columns are varchar(20). |……..GROUP……| |…….LOCAL…….| |…….SERVICE…….| | id_G | name_group | | id_L | name_local | | id_S | name_service | +——+————+ +——+————+ +——+————–+ […]

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Mastering Development

Cost efficiency for AWS Lambda Provisioned Concurrency

I’m running a system with lots of AWS Lambda functions. Our load is not huge, let’s say a function gets 100k invocations per month. For quite a few of the Lambda functions, we’re using warmup plugins to reduce cold start times. This is effectively a CloudWatch event triggered every 5 minutes to invoke the function […]