/
ble.go
75 lines (66 loc) · 1.55 KB
/
ble.go
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package main
import (
"log"
ble "tinygo.org/x/bluetooth"
)
var adapter = ble.DefaultAdapter
var addrMap = loadAddresses()
func loadAddresses() map[string]ble.Address {
macs := [2]string{Config.Bots.Gate, Config.Bots.Garage}
addrMap := make(map[string]ble.Address, 2)
for _, macStr := range macs {
mac, err := ble.ParseMAC(macStr)
if err != nil {
log.Fatalln("Failed parsing MAC address", macStr, err.Error())
}
addrMap[macStr] = ble.Address{MACAddress: ble.MACAddress{MAC: mac}}
}
return addrMap
}
func startBLE() {
err := adapter.Enable()
if err != nil {
log.Fatalln("BLE error", err.Error())
}
adapter.SetConnectHandler(func(addr ble.Address, connected bool) {
state := "connected"
if !connected {
state = "disconnected"
}
log.Println("Device", addr, state)
})
preapreBLECache()
}
func preapreBLECache() {
trackers := makeTrackers(addrMap)
needMore := len(trackers)
err := adapter.Scan(func(_ *ble.Adapter, res ble.ScanResult) {
if needMore == 0 {
return
}
log.Println("Found device", res.Address.String())
found, exists := trackers[res.Address]
if !exists || found {
log.Println("Discarded")
return
}
trackers[res.Address] = true
log.Println("Saved")
needMore--
if needMore == 0 {
adapter.StopScan()
log.Println("Found all devices")
}
})
if err != nil {
log.Fatalln("Failed scanning")
}
}
func makeTrackers[K comparable, V comparable](items map[K]V) map[V]bool {
size := len(items)
trackers := make(map[V]bool, size)
for _, item := range items {
trackers[item] = false
}
return trackers
}