Release 1.2.3

This is a minor bug-fix release. This release fixes the handling of oversize application payloads in the modem and adds correct support for hexadecimal payload formats to the companion Python management tool.

In earlier versions, the modem would return a +OK if it received an application payload too big to fit into the uplink message. Since no uplink would actually be sent in this case, the follow-up +ACK/+ACK would never be emitted. Starting in version 1.2.3, the modem returns a +ERR=-12 in this case to indicate to the application that it may need to resend the message.

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Full changelog: v1.2.2...v1.2.3