fix #170 and #175, include #171, and test ASIA923

[takurx]

Proposed changes

This report is on IoTagent-LoRaWAN works on ASIA923 with little modification. Similar change may be applied to AU915/US915 and other regions. This pull request is not intended to be merged because I don't want to re-write stm32_ttn_tutorial for ASIA923

fix #170 and #175, include #171, and test ASIA923 And I checked to work stm32_ttn_tutorial in Japan and on TTN v3

Types of changes

What types of changes does your code introduce to the project: Put an x in the boxes that apply

• [x] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• [x] I have read the CONTRIBUTING doc
• [x] I have signed the Contributor License Agreement
• [ ] I have updated the CHANGE LOG
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added necessary documentation (if appropriate)
• [ ] Any dependent changes have been merged and published in downstream modules

Further comments

N/A

"IoT Agent LoRaWAN Entity Contributor License Agreement"

"Contributing to IoT Agent LoRaWAN"

"IoT Agent LoRaWAN Change Log"

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