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Sure, have a look at the source code.
LINK

The install.sh script contains all you need.
When you have entware, just use

opkg install strace

A lot of info comes from running wdtms like this:

export LD_LIBRARY_PATH=/opt/wd/lib:/opt/wd/lib/boost
pkill wdtms
strace -f /opt/bin/wdtms -config=/etc/wd/BNFA-thermal.xml

I’m still going through, but you see commands passing by such as

i2cget -y 8 0x4c 0x10

This is polling the fractional byte of the temperature sensor… seems a bit useless to me but whatever.
More interesting is address 0x00 for the internal sensor and address 0x01 / 0x23 for the external sensors…