STEVAL-STLKT01V1 is equipped with consumer/general purpose sensors where STWIN STEVAL-STWINKT1 hosts industrial grade sensors hence both are useful for different applications so also SW examples we provide are different. E.g. the predictive maintenance examples are running at STWIN and not on STEVAL-STLKT01V1, it is not clear question about the multiple nodes connection, so please specify more precisely what connection scenario you have in mind. In any case, one of the ways to create a network of nodes is referred here
https://www.st.com/content/st_com/en/products/embedded-software/mcu-mpu-embedded-software/stm32-embedded-software/stm32cube-expansion-packages/x-cube-blemesh1.html
https://www.st.com/content/st_com/en/products/embedded-software/mcu-mpu-embedded-software/stm32-embedded-software/stm32-ode-function-pack-sw/fp-sns-blemesh1.html
https://www.st.com/content/st_com/en/products/embedded-software/wireless-connectivity-software/stblemesh.html
