Port open failure may occur on LAN I/F with continuous open/close

[bandit-ibayashi]

Phenomenon

When repeatedly printing with an execution of StarPrinter.open() and StarPrinter.close() methods via LAN interface, StarIO10Error.inUse error may be occurred in StarPrinter.open() method.

Conditions for Occurrence

• Printer Interface: LAN (both wired and wireless)
• When the Auto Switch Interface feature of StarIO10 is turned off, or when the connected printer model does not support the Auto Switch Interface.
  • Auto Switch Interface feature: https://www.star-m.jp/products/s_print/sdk/react-native-star-io10/manual/en/api-reference/star-connection-settings/auto-switch-interface.html#star-connection-settings-auto-switch-interface
• After executing the StarPrinter.close() method on the printer, if the StarPrinter.open() method is executed on the same printer within a few hundred milliseconds.

Cause

It has been identified that after calling the iOS API by Apple Inc. to close the communication port of the printer, there can be a delay before the iOS device sends the communication for the closing process.
During this interval, until the printer receives the port closing process from the iOS device, the next port opening will fail.

Workaround

If the StarIO10Error.inUse error is thrown, please add an wait for approximately 500 milliseconds (*) before re-executing the StarPrinter.open() method.

• In our testing, we have confirmed that a wait time of 500 milliseconds prevents this issue from occurring. However, please adjust according to your individual environment.