Octave protocol and new sensor question

I use mangOH yellow with WP7702 module. Then, I have 4 questions for Octave, please advise them.

Q1. We can send some information as 1 message when we use “store & Forward” function.
Please let us know the maximum data size on 1 message.

Q2. Edge device (WP7702) is sending data to Octave server. What protocol do octave use? TCP protocol? Or HTTP?

Q3. I would like to verify the true function on Octave at default setting.
I think that /util/cellular/signal/enable is true at default setting. Is my understanding correct?

Q4. If customer would like to add new sensor via IoT slot card (ex. USB), should customer create it by legato (mangOH)?

Moving this topic to #octave category