Hello guys.
I have got some problem.
My App works with printer Zebra ZQ520. I connected with BLE. When I send some command like
private func writeZebraScript(zpl: String) {
guard let bytes = zpl.data(using: .utf8), let chars = self.discoverWriteCharacteristic
else {
let error = "Problem with data for zebra script.\nBytes =" +
"\(zpl.data(using: .utf8) ?? Data())\nCharacteristic = " +
"\(String(describing: self.discoverWriteCharacteristic))\n"
logMessage(error, in: #function, from: "\(Self.self)")
return
}
self.selectedPrinter?.writeValue(bytes, for: chars, type: .withResponse)
}
func sendToPrint(text: String) {
let str = "^XA^FO20,20^BY3^B3N,N,150,Y,N^FD\(text)^FS^XZ"
let zpl: String = str + "\r\n"
self.writeZebraScript(zpl: zpl)
}
func calibrate() {
let zpl = "~jc^xa^jus^xz +\r\n"
self.writeZebraScript(zpl: zpl)
}
func initialSettings() {
let zpl = "! U1 setvar \"media.type\" \"label\"" +
"! U1 setvar \"media.sense_mode\" \"gap\"" + "~jc^xa^jus^xz" + "~SD30"
self.writeZebraScript(zpl: zpl)
}
It works amazing.
But when I try to do
guard let serialNumber = self.receivedDataFromDISCharacteristic[
ZebraKeysLib().zPrinteDisSerialNumber
] else {
logMessage("serialNumber is nil", in: #function, from: "\(Self.self)")
return
}
self.connection = MfiBtPrinterConnection(serialNumber: serialNumber)
self.connection?.open()
My self.connection?.isConnected is always false. And I`m not able to do my next work. Why do I have this problem?