examples: add example that makes connections to multiple peripherals #318
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Signed-off-by: deadprogram <ron@hybridgroup.com>
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What is the main purpose of the example? Show it is possible to connect to several peripherals and subscribe to notifications from them? If so, I find all this dance with specifying device addresses unnecessary -- it just bloats the example code. Can we instead just subscribe to any HR bluetooth device we can find? Simplifies code and makes it easier to try out. |
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I've tried to see if it works with SoftDevice (xiao-ble) and it does not seem to do. It is stuck here ☝️ Two heart rate boards are Nano-RP2040, flashed like this: |
ysoldak
reviewed
Jan 8, 2025
| // ContextWithSignal creates a context canceled when SIGINT or SIGTERM are notified | ||
| func contextWithSignal(ctx context.Context) context.Context { | ||
| newCtx, cancel := context.WithCancel(ctx) | ||
| signals := make(chan os.Signal) |
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| signals := make(chan os.Signal) | |
| signals := make(chan os.Signal, 1) |
My editor warned me the channel shall be buffered here.
ysoldak
reviewed
Jan 8, 2025
| select { | ||
| case <-signals: | ||
| cancel() | ||
| } |
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This whole block can be simplified:
go func() {
<-signals
cancel()
}()
ysoldak
reviewed
Jan 8, 2025
| // Replace this by using -ldflags="-X main.Devices='[MAC ADDRESS],[MAC ADDRESS]'" | ||
| // where [MAC ADDRESS] is the actual MAC address of the peripheral. | ||
| // For example: | ||
| // tinygo flash -target nano-rp2040 -ldflags="-X main.Devices='7B:36:98:8C:41:1C,7B:36:98:8C:41:1D" ./examples/heartrate-monitor/ |
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| // tinygo flash -target nano-rp2040 -ldflags="-X main.Devices='7B:36:98:8C:41:1C,7B:36:98:8C:41:1D" ./examples/heartrate-monitor/ | |
| // tinygo flash -target nano-rp2040 -ldflags="-X main.Devices='7B:36:98:8C:41:1C,7B:36:98:8C:41:1D" ./examples/multiples/ |
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This PR adds a new example that makes connections to multiple peripherals.
It has been tested and is known to be working on Linux and on HCI with NINAFW, as long as #317 has been merged first.
On Linux I tested with 6 simultaneous connections. It might allow more.
On HCI I tested with 3 simultaneous connects. Again, more might also work.