create a macos launchd file, use channels to wait for BLE con
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@ -14,3 +14,7 @@ If you're on macOS, the Python pybluez Bluetooth drivers don't work (well) on th
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The script checks a folder for files (intended to be set up as a cron job), if there are any, sends them to the printer (if detected), **and deletes them**.
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See `main.go`, you'll probably want to edit some variables. I hacked everything together in a day for our specific case.
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## Launchd service
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To install as a `launchd` service (mac's "cron"), copy the binary to `/usr/local/bin` and the file `com.brainbaking.PhomemoPrinter.plist` to `~/Library/LaunchAgents`. Then, in a terminal, type `launchctl load com.brainbaking.PhomemoPrinter.plist`.
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@ -0,0 +1,28 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
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<plist version="1.0">
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<dict>
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<key>Label</key>
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<string>com.brainbaking.phomemoprinter</string>
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<key>ProgramArguments</key>
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<array>
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<string>/usr/local/bin/phomemoprinter</string>
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</array>
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<key>Nice</key>
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<integer>1</integer>
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<key>StartInterval</key>
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<integer>60</integer>
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<key>RunAtLoad</key>
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<true/>
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<key>StandardErrorPath</key>
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<string>/tmp/PhomemoPrinter.err</string>
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<key>StandardOutPath</key>
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<string>/tmp/PhomemoPrinter.out</string>
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</dict>
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</plist>
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55
main.go
55
main.go
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@ -6,6 +6,7 @@ import (
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"os"
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"os/exec"
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"strconv"
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"strings"
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"time"
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"tinygo.org/x/bluetooth"
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)
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@ -18,29 +19,40 @@ func main() {
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inDir := home + phomemoFolder
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files, err := os.ReadDir(inDir)
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must(phomemoFolder, err)
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must(phomemoFolder + " does not exist", err)
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if len(files) == 0 {
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log.Printf("No files to print found in %s. Quitting.\n", inDir)
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log.Printf("No files to print found in %s, nothing to do. Quitting.\n", inDir)
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os.Exit(0)
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}
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// Enable BLE interface.
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must("enable BLE stack", adapter.Enable())
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must("Enable Bluetooth stack", adapter.Enable())
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// Start scanning. Use this to figure out your device's UUID. Phomemo uses a non-random one.
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println("scanning...")
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var phomemoAddress bluetooth.ScanResult
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log.Println("Scanning for Bluetooth devices...")
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ch := make(chan bluetooth.ScanResult, 1)
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timeout := make(chan bool, 1)
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go func() {
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time.Sleep(10 * time.Second)
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timeout <- true
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}()
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go func() {
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err = adapter.Scan(func(adapter *bluetooth.Adapter, device bluetooth.ScanResult) {
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if device.LocalName() == "Mr.in_M02" {
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phomemoAddress = device
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println("found device: ", device.Address.String(), device.RSSI, device.LocalName())
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ch <- device
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adapter.StopScan()
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}
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})
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must("start scan", err)
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}()
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select {
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case device := <- ch:
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log.Println("Found device: ", device.Address.String(), device.RSSI, device.LocalName())
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tryToPrint(device, inDir, files)
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case <- timeout:
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log.Fatal("Timeout trying to locate Phomemo M02, is it on? Quitting.")
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}
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tryToPrint(phomemoAddress, inDir, files)
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}
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func tryToPrint(phomemoAddress bluetooth.ScanResult, dir string, files []os.DirEntry) {
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@ -66,31 +78,42 @@ func tryToPrint(phomemoAddress bluetooth.ScanResult, dir string, files []os.DirE
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chars, err := srvc.DiscoverCharacteristics(nil)
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must("failed to discover characteristics of service", err)
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dumpFilter("phomemo-filter.py")
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pyfilterloc := dir + "/" + "phomemo-filter.py"
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dumpFilter(pyfilterloc)
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defer func() {
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os.RemoveAll("phomemo-filter.py")
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os.RemoveAll(pyfilterloc)
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}()
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// 3 characteristics to discover 0000ff01, 0000ff02, and 0000ff03
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for _, file := range files {
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filePath := dir + "/" + file.Name()
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writeData(filePath, chars[1]) // 0000ff02-...
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if isPossibleToPrint(filePath) {
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writeData(pyfilterloc, filePath, chars[1]) // 0000ff02-...
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readResult(chars[0]) // 0000ff01-...
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os.RemoveAll(filePath)
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}
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}
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log.Println("-- DONE")
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}
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func isPossibleToPrint(filename string) bool {
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return strings.HasSuffix(filename, ".jpg") ||
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strings.HasSuffix(filename, ".JPG") ||
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strings.HasSuffix(filename, ".png") ||
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strings.HasSuffix(filename, ".PNG")
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}
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func dumpFilter(filename string) {
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err := os.WriteFile(filename, phomemofilter.Pyfilter, 0666)
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must("unable to dump python filter for use", err)
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}
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func writeData(path string, char bluetooth.DeviceCharacteristic) {
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func writeData(pyfilterloc string, path string, char bluetooth.DeviceCharacteristic) {
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// first, it needs to be prepared for the printer
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pathpho := path + ".pho"
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argstr := []string{"-c", "python phomemo-filter.py " + path + " > " + pathpho}
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argstr := []string{"-c", "/usr/local/bin/python " + pyfilterloc + " " + path + " > " + pathpho}
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log.Println("args", argstr)
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_, err := exec.Command("/bin/zsh", argstr...).Output()
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must("something went wrong while filtering phomemo data py", err)
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