’ve been working on a project that tries to solve a pretty real problem—what happens when communication completely breaks down during disasters?

In situations like floods, earthquakes, or cyclones, internet and mobile networks often go down. That makes it incredibly hard for people to send distress signals or coordinate rescue.

So I built a low-cost offline communication system using ESP32 that works without any internet or cellular connectivity.

⚙️ How it works:

• Uses ESP-NOW (peer-to-peer protocol on ESP32)
• Devices can broadcast messages without pairing
• Pressing a button sends an instant “HELP” signal
• Nearby ESP32 nodes receive it immediately

Think of it like a mini emergency broadcast network that just works out of the box.

🔥 Key features:

• Fully offline (no WiFi/router needed)
• No manual setup or pairing
• Very low cost hardware
• Fast, low-latency communication
• Designed specifically for emergency SOS use

🧠 What I’m exploring next:

• Controlled rebroadcast (so it doesn’t spam the network)
• Multi-hop communication (pseudo mesh)
• GPS-less localization using signal strength
• Priority-based messages (HELP > others)

❓ Would love feedback on:

• Better ways to handle message propagation without flooding
• If anyone has tried combining ESP-NOW + LoRa
• Ideas for making this more deployable in real disaster scenarios