{"id":13317,"date":"2022-01-28T16:06:03","date_gmt":"2022-01-28T21:06:03","guid":{"rendered":"https:\/\/rud.is\/b\/?p=13317"},"modified":"2022-01-28T16:06:03","modified_gmt":"2022-01-28T21:06:03","slug":"a-weatherflow-tempest-udp-broadcast-receiver-in-golang-rust-swift-and-c","status":"publish","type":"post","link":"https:\/\/rud.is\/b\/2022\/01\/28\/a-weatherflow-tempest-udp-broadcast-receiver-in-golang-rust-swift-and-c\/","title":{"rendered":"A WeatherFlow Tempest UDP Broadcast Receiver in Golang, Rust, Swift, and C++"},"content":{"rendered":"

After a Twitter convo about weather stations I picked up a WeatherFlow Tempest<\/a>. Setup was quick, but the sensor package died within 24 hours. I was going to give up on it but I had written an R package (for the REST API & UDP broadcast interfaces) and C++ utility (for just the UDP broadcast interface), and the support staff were both friendly and competent and sent me a replacement super quick.<\/p>\n

I’ve blathered about the R package already (on Twitter) so am not going to tag that here, but will link to a few repositories (in various languages) that receive the UDP broadcast messages<\/a> and at least shove them to stdout<\/code>.<\/p>\n

The C++ one<\/a> is mostly C but gets the job done (it just posts the messages to stdout<\/code>). It should run everywhere but I only tested on macOS & Linux, because Windows is a terrible operating system nobody should use.<\/p>\n

The Golang one<\/a> has some structured types to consume about half of the JSON messages (I’ve only seen four in the broadcasts so far, and will add more as I see new ones). It’s only more verbose than the C++ one due to the various record type handling. This should run everywhere, though.<\/p>\n

For kicks, I threw together a Swift one<\/a> that is really just Swift-ified C and is a Frankenstein monster that likely shouldn’t be used. (I’ll be making a SwiftUI macOS\/iOS\/iPadOS app for the UDP broadcast messages, though, soon).<\/p>\n

To round out my obsession I also made a Rust version<\/a> which I’m just in ? with (not because of any skill of my own). It’s the smallest source file and is pretty elegant (100% due to Rust, and, again, not me).<\/p>\n

All the code\/projects are super small, but the Rust source is so tiny that it won’t be too intrusive to post here:<\/p>\n

use std::net::UdpSocket;\n\nfn main() -> std::io::Result<()> {\n\n  let mut buf = [0; 1024]; \/\/ 1024 byte buffer is plenty\n  let s = UdpSocket::bind(\"0.0.0.0:50222\").expect(r#\"{\"message\":\"Could not bind to address\/port.\"}\"#);\n\n  loop {\n\n    let (n, _) = s.recv_from(&mut buf).expect(r#\"{\"message\":\"No broadcasts received.\"}\"#);\n\n    println!(\"{}\", String::from_utf8(buf[..n].to_vec()).unwrap())\n\n  }\n\n}\n<\/code><\/pre>\n
FIN<\/h3>\n
If you’re interested in a low-cost weather station with great DIY programming support, I’d definitely (so far, at least) recommend the Tempest. We’ll see if it survives the forthcoming snowpocalypse.<\/p>\n
These are the JSON messages it slings over UDP:<\/p>\n
{\"serial_number\":\"HB-00069665\",\"type\":\"hub_status\",\"firmware_revision\":\"177\",\"uptime\":728643,\"rssi\":-50,\"timestamp\":1643246011,\"reset_flags\":\"BOR,PIN,POR\",\"seq\":72787,\"radio_stats\":[25,1,0,3,16637],\"mqtt_stats\":[10,108]}\n{\"serial_number\":\"ST-00055227\",\"type\":\"rapid_wind\",\"hub_sn\":\"HB-00069665\",\"ob\":[1643246013,0.00,0]}\n{\"serial_number\":\"ST-00055227\",\"type\":\"rapid_wind\",\"hub_sn\":\"HB-00069665\",\"ob\":[1643246015,0.00,0]}\n{\"serial_number\":\"ST-00055227\",\"type\":\"device_status\",\"hub_sn\":\"HB-00069665\",\"timestamp\":1643246016,\"uptime\":106625,\"voltage\":2.683,\"firmware_revision\":165,\"rssi\":-72,\"hub_rssi\":-66,\"sensor_status\":655364,\"debug\":0}\n{\"serial_number\":\"ST-00055227\",\"type\":\"obs_st\",\"hub_sn\":\"HB-00069665\",\"obs\":[[1643246016,0.00,0.00,0.00,0,3,1024.56,-12.82,47.84,0,0.00,0,0.000000,0,0,0,2.683,1]],\"firmware_revision\":165}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
After a Twitter convo about weather stations I picked up a WeatherFlow Tempest. Setup was quick, but the sensor package died within 24 hours. 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