Incorrect channel mask setting

[mikeluyten]

Describe the bug

The current library/examples have a channel mask as part of the setband command. However this is only applicable for Bands "US915, AU915, LA915, CN470" (as per https://docs.rakwireless.com/product-categories/software-apis-and-libraries/rui3/at-command-manual/#atmask), this not applicable and will fail for the AS bands. e.g. AS923-1

To reproduce

Use example and set a band of AS923-1 (use serial outputs in the loops to see where it gets stuck)
It will be unable to set the band due to an error on AT+MASK for that band.

Expected behavior

Channel mask should be set separately in another command, or the mask ignored in the library if not applicable for bands that don't support it

Screenshots

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Environment

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Additional context

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Issue checklist

• I searched for previous reports in the issue tracker
• My report contains all necessary details