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ProgrammingDEV Community ·

Connecting a 60GHz mmWave Radar to Home Assistant via MQTT: A Verified Guide

A tutorial explains how to link a 60GHz mmWave radar, used for fall detection, presence, or sleep monitoring, to the Home Assistant platform. The radar sends JSON data over MQTT to a broker, which Home Assistant subscribes to and converts into viewable entities on a local dashboard. The guide was tested on Windows 11 using WSL2 and Home Assistant Core 2025.1.4 with a live radar and an Apache Artemis broker. It covers the required broker and radar setup, the topic structure using the device's MAC-based DeviceID, and installation options for Home Assistant, with the HA Core route recommended for Windows.

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ProgrammingDEV Community ·

A One-Week Plan to Prepare for a Job Interview, With STAR Answers and Mock Rounds

A guide published on DEV Community lays out a seven-day plan for getting ready for a job interview. It recommends building a list of likely questions from the job posting and writing answers using the STAR format of situation, task, action and result. The author advises practicing answers out loud with a timer, since written answers often run long when spoken. The plan also stresses preparing negotiation notes before any offer arrives and running a mock interview with a friend or colleague who can give honest feedback. The article notes that its author built an interview prep tool, so readers should weigh the advice accordingly.

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ProgrammingDEV Community ·

Report Flags High-Medium Oracle Manipulation Risk for Rocket Pool Liquid Staking

An independent security report dated 18 October 2026 assigns Rocket Pool, a major Ethereum liquid-staking protocol with roughly $1.23 billion in total value locked, an overall oracle manipulation risk score of 7 out of 10. The protocol relies on external data feeds, including Chainlink and a Uniswap V3 time-weighted average price fallback, to price rETH and track validator rewards. The analysis identifies four attack vectors, among them price feed manipulation, fallback TWAP skewing, and beacon-chain state spoofing. Researchers warn that successful manipulation could cause over- or under-minting of rETH, misallocated staking rewards, or erroneous slashing outcomes. The report concludes that gaps in aggregation logic, timeliness controls, and fallback handling leave the protocol exposed despite its multi-source design.

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ProgrammingDEV Community ·

Connecting a 60GHz Fall Detection Radar to Home Assistant via MQTT

A verified guide explains how to link a 60GHz fall detection radar to Home Assistant so its fall alarm and presence data appear on a dashboard. The radar publishes JSON over MQTT to a broker, which Home Assistant subscribes to and converts into entities. The setup was tested on Windows 11 using WSL2 and Home Assistant Core 2025.1.4 against a live radar and Apache Artemis broker. The walkthrough covers installing Home Assistant Core on Ubuntu under WSL2, including Python and system package prerequisites, and running it as a background process. Home Assistant is presented as a free, open-source, local-first hub that keeps data off the cloud.

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ProgrammingDEV Community ·

PactSignal Prototype Tracks Client Agreements Across Messaging Channels

PactSignal is a prototype developed for the Hacktoberfest Open-Source AI Challenge that helps teams decide which client cases need action by reviewing the history of each relationship. It records the current agreement, the changes leading to it, the responsible person, and the evidence behind the next step. The system distinguishes between requests, approved changes, and payment claims, so a reported payment is not treated as a confirmed receipt. A fictional photography example shows how a case can move through approvals, withdrawn requests, and a handover between staff. The project is intended to complement CRM and accounting tools, though live email, Telegram, and WhatsApp connections are not yet implemented.

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ProgrammingDEV Community ·

NVFP4 Decodes 2.3x Faster Than BF16 on a 16 GB Ada GPU, Matching Its GSM8K Accuracy

A developer benchmarked the Nemotron Labs Dory 1.0 4B model in BF16, NVFP4, MXFP8, FP8 and GGUF formats on an RTX 4070 Ti SUPER with 16 GB of memory. Among the vLLM formats, text generation speed followed weight size, with NVFP4 running 2.3 times faster than BF16 through a weight-only kernel. FP8 led on long-prompt reading because it is the only tested format whose multiplications Ada GPUs perform in 8-bit precision. On the full GSM8K math benchmark, all formats scored within a statistical tie with BF16, though NVFP4 matched BF16's next-token choices less often than FP8 or MXFP8. The author also documented several measurement pitfalls encountered along the way, and published the full results and scripts online.

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ProgrammingDEV Community ·

Developer builds IboChat, a multilingual AI voice chat app with custom characters

A developer created IboChat, a Flask-based web app where AI characters reply in both text and speech across more than 24 languages. Users can talk or type, and users can also design their own character in minutes. The backend uses the glm-4.5-air model via the Z.ai API, faster-whisper for speech-to-text, and SQLite for accounts, deployed with Docker behind Cloudflare. To produce voices, the app falls back through three tiers: GPT-SoVITS for cloned voices, OmniVoice for broad language coverage, and Edge TTS as a reliable safety net. The author describes resource-contention and model-loading problems on a shared 4GB GPU, which were solved through on-demand model launching and fallback logic rather than new hardware.

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ProgrammingHacker News ·

Dogs Appear to Match Humans in Linking 'Bouba' With Round Shapes and 'Kiki' With Spiky Ones

A study suggests that dogs, like humans, associate the nonsense word 'bouba' with rounded shapes and 'kiki' with spiky ones. The finding is based on the animals' behavior when presented with paired shapes and sounds. Researchers view this as evidence that this sound-shape link may not depend solely on human language experience. The results point to a possible shared sensory mechanism across species. The report was shared on Hacker News, where it drew moderate attention from readers.

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ProgrammingHacker News ·

Meta Reportedly Removed a No Kings Instagram Account on Protest Day

A report from MeidasNews claims Meta took down an Instagram account associated with the No Kings protest movement on a day of large demonstrations. The article was shared on Hacker News, where it drew 66 points and 10 comments. The source material provided is limited to the headline, link, and engagement metrics, so specific details about the account, the timing of the removal, and Meta's stated reasoning are not confirmed here. The story reflects ongoing public debate over social media platforms' content moderation during politically charged events. Readers should consult the original report for full context and any response from Meta.

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ProgrammingDEV Community ·

Connecting your own Supabase project to Lovable apps: setup and key caveats

Lovable apps get Lovable Cloud by default, which runs on Supabase, but this guide focuses on connecting a Supabase project you own, which is typically preferred for apps with real users. Setup happens in two steps: a workspace owner or admin first links a Supabase organization, then an editor connects a Lovable project to one of its Supabase projects. A common snag is that editors cannot add an organization themselves, so the owner or an admin must complete that step first. Switching between Cloud and your own Supabase later is not one-click and requires manual migration work, so it is best decided at the start. Once connected, schema changes are saved as migration files in the repository, while data changes and secrets stay under your control in the Supabase dashboard, and the author stresses manually verifying row-level security policies before launch.

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ProgrammingDEV Community ·

Browser-Based Image-to-Bead Pattern Generator Uses CIE Lab Color Matching

A developer team built BeadPattern, a tool that converts photos into fuse bead patterns entirely within the user's browser, so images never reach a server. Matching colors in standard RGB produced muddy results for pastels and skin tones, so the team converted pixels and bead palettes into CIE L*a*b* space and used CIE76 distance instead. To keep slider adjustments responsive, they precomputed palette vectors and indexed them in a K-d tree for faster nearest-neighbor lookups. They also applied Floyd-Steinberg error diffusion to reduce color banding in gradients when mapping to a limited palette.

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ProgrammingDEV Community ·

Netflix Q3 2026 earnings prep: guidance history, events and deck via MCP server

A developer who builds the Equibles stock market data MCP server shows how an AI agent can assemble investor relations material for Netflix's Q3 2026 earnings interview, scheduled for 20 October at 20:45 UTC. The tool lists the company's investor events, including the earnings call, the June annual meeting and a March conference appearance, with transcripts and slides where available. Tracking Netflix's full-year 2026 guidance across three releases shows the revenue range narrowing in July, the operating margin target unchanged at 31.5%, and the free cash flow target raised by $1.5B in April. The author also describes how a CFO's March conference remarks can be checked against the January plan, and notes the tool flags releases that have not yet been fully processed.

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ProgrammingDEV Community ·

Gemini Gas Optimization Audit Finds Savings Potential and Gas-Related DoS Risks

An audit of Gemini's on-chain contracts, which hold roughly $5.34 billion in total value locked across Ethereum and Layer 2 networks, examined gas efficiency and gas-related attack vectors. Reviewers used static analysis, mainnet-fork profiling, and L2 testing on Arbitrum and Optimism to identify inefficiencies. Key issues included storage-slot fragmentation, quadratic gas growth in batch settlement, and external calls without gas caps that could enable griefing on congested L2 networks. The auditors estimated optimizations could cut gas costs by about 12 to 22 percent per operation, potentially saving around $3.2 million annually. The overall risk score was rated 4 out of 10, with recommended upgrades targeted within four to six weeks.

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ProgrammingDEV Community ·

Payment platforms that can pay developers in USD outside the US: a comparison

A developer compared 50 payment platforms to find which ones will onboard and pay out USD to people in countries Stripe does not support. The author argues that eligibility by country, entity type and product type should be checked before comparing fees. Merchant of Record platforms are highlighted because they handle sales tax, fraud, chargebacks and refunds, which can remove the need for a local entity. The piece lists fee structures for several platforms, including Polar, Creem, Dodo Payments, Payhip and FastSpring, and notes that Lemon Squeezy is now owned by Stripe. It also explains that receiving the money in a local bank requires a second step, with Payoneer described as a common option, and that fees and terms should be confirmed on each provider's own pricing page.

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ProgrammingDEV Community ·

Hidden Costs of AI APIs: Context History and Rate Limits Add Up Fast

A developer who spent six months building an AI analytics tool found that the per-token API price was only part of the expense. Chatbots resend the entire conversation history with every request, so a short question can balloon into thousands of billed tokens. Implementing a context summarizer cut costs by about 60%, though it added engineering complexity. Rate limits designed for prototyping also caused 429 errors during a client demo, requiring custom retry-with-backoff logic. The author argues that developers should budget for these overlooked costs, including the engineering time needed to handle them.

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ProgrammingDEV Community ·

Why Anki image occlusion cards import as plain cloze, and the one-line fix

A developer building AnkiForge, a tool that generates Anki cards from lecture PDFs and labelled diagrams, found that image occlusion cards were not behaving as real image occlusion. Copying the stock note type's templates and field names was not enough, because Anki desktop checks a specific config value to decide whether to show the mask editor. Setting originalStockKind to the image occlusion value (6) resolves the problem, and without it the editor shows plain text fields with raw occlusion strings. The developer also matched Anki's exact coordinate formatting so exported notes match those saved after a round trip through the editor. Testing was done with the Anki Python package, which uses the same backend as the desktop app, to verify the output.

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ProgrammingDEV Community ·

Why jstack Can Miss Blocked Requests in Java Services Using Virtual Threads

A Spring Boot service with virtual threads and a 10-connection HikariCP pool can show climbing latency while thread dumps look nearly idle. Standard jstack and jcmd Thread.print output lists platform threads, such as the carrier threads that run virtual threads, so waiting requests may not appear. On JDK 21 through 25, the author recommends using jcmd Thread.dump_to_file, which captures virtual threads as well, with plain or JSON output depending on needs. Dump contents vary by JDK version, with JDK 25 adding state, timestamps, and lock information. Counting and inspecting stacks that include HikariPool.getConnection can reveal how many requests are queued on the database pool.

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ProgrammingDEV Community ·

Moderating Video Room Participants: Muting Versus Removing During Live Polls

A removed participant must stop receiving the room's media and stop counting toward live poll presence, while a muted participant can still watch and vote. The distinction matters because muting an audio source does nothing to revoke access to a shared screen. Moderation should be modeled as a permission change on a specific publishing track for muting, and as revoking room membership, media delivery, and poll eligibility for removal. A single button click or a WebRTC track event does not prove all of those effects occurred, so each should be verified separately. The article recommends counting poll participants from server-side membership state rather than connected tracks, recording an authorization revision with each accepted vote, and defining a reconnect grace period explicitly.

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ProgrammingDEV Community ·

Cursor raises Pro price 50% as AI and SaaS vendors shift pricing this week

A weekly tracker of 133 AI and SaaS pricing pages found 12 that changed price-related content in the past seven days. Cursor's entry plan rose from $40 to $60, a 50% increase detected on September 20. Activepieces raised its entry price from $16 to $20 per month, a 25% jump. Several providers, including Deepgram, Supabase, and Asana, reduced or removed free tiers or pricing options, while Anthropic cut a price and xAI and AssemblyAI restructured theirs. Intercom and Pika also reported price increases during the period.

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ProgrammingDEV Community ·

Five Developer Tools Updated in October 2026, Spanning AI, NLP, and ML Workflows

A roundup from DEV Community highlights five developer tools released or updated in October 2026. These include the LangChain SDK for JavaScript, released October 12, which lets Node.js developers build language model apps, and the DALL-E 3 API, launched October 11 with better image quality and faster generation. Hugging Face Transformers 5.0, released October 10, adds new pre-trained models and performance optimizations for NLP and multimodal work. The OpenAI Codex CLI, released October 13, brings code generation and debugging to the terminal, while MLflow 2.3 (October 8) adds experiment tracking and model deployment features. The article also offers tutorials and install guidance for each tool.

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