Node-red-contrib-modbus package in IoT - Which command should use to install the package?

Hello, 

As you suggested, the IOT2040 can ping to a web site.

Howerver, I still have the problem above when run "npm install node-red-contrib-modbus" at directory "/usr/lib/node_modules".

[snip]

Q2: which command should I use to install the package ?

Thanks.

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Split from Where should put the downloaded node-red-contrib-modbus package in IoT?.

Hey

Did you succeed in installing the packages without an internet connection?

Kind regards