This mod adds only 2 blocks to the game. One monitors whatever it's facing, the other can output redstone signals or change filters on create machines.

Usage

Windows curl is NOT the same as MacOS and Linux curl. Use WSL if you're testing on windows

for the blue block (the monitor), you can get a JSON output of whatever it's monitoring like this curl http://<IP>:<port|27100>/<ID>

or if it's password protected curl http://<IP>:<port|27100>/<ID>?password=<password>

This supports most mod's blocks that have NBT as well as FE electrics.

for the red one (the output), you can set a redstone signal, pulse, or set create filters.

set redstone strength curl -X POST http://<IP>:<port|27100>/<ID> -d '{"redstone":<0-15>}'

pulse the block … -d '{"pulse":}''

set a create machine's filter … -d '{"filter":""}'

or multiple (must have a create filter in the filter slot) ... -d '{"filter":["item ID 1","item ID 2"...]}'

clear filter ... -d '{"clearFilter":true}'

single-line address (typical for packagers) ... -d '{"sign":"warehouse/station1"}' up to 4 lines (Create joins non-blank lines with no separator) ... -d '{"sign":{"lines":["wh","station1"]}}' optional: pick which adjacent sign ... -d '{"sign":{"text":"addr","side":"up"}}' clear sign data .. -d '{"clearSign":true}'

OC2: Modern versions

Monitor

local d = require("devices")
local t = d:find("boiler")   -- or d:find("telemetry")
print(t:getJson()) 

Actuator

local a = require("devices"):find("gate")  -- your device name, or "telemetry_actuator"
a:setRedstone(15)
print(a:getRedstone())
a:pulse(20)
a:setFilter("minecraft:cobblestone")
-- multi-item needs a real Filter already in the machine:
a:setFilter('["minecraft:iron_ingot","minecraft:gold_ingot"]')
a:clearFilter()
a:setSign("warehouse/station1")
a:clearSign()

You can also run commands on OC2 computers from HTTP actuators

# run a shell command on the OC
curl -X POST http://127.0.0.1:27100/gate -d '{"run":"uptime"}'
# → {"ok":true,"jobId":"...","queued":true,...}
# wait for the daemon
curl 'http://127.0.0.1:27100/gate?job=<jobId>'
# → status DONE/ERROR + result
curl -X POST http://127.0.0.1:27100/gate \
  -d '{"writeFile":{"path":"/home/out.txt","content":"hello","encoding":"utf8"}}'
curl -X POST http://127.0.0.1:27100/gate \
  -d '{"readFile":{"path":"/home/out.txt"}}'

#OC2: Modern <-> CC: Tweaked bridge

uses a daemon on the client computer to run stuff sent to it by a host (experimental)

OC2 -> CC: Tweaked

local b = require("devices"):find("cc_oc_bridge")
local id = b:submitCc("return 2+2")
-- wait a tick or two
print(b:poll(id))  

CC: Tweaked -> OC2

local b = peripheral.find("cc_oc_bridge")
-- enqueue (returns job id)
local id = b.submitOc("return 2+2")

you need the respective lua daemon on the client computer. OC2 has it on the filesystem, but CC: Tweaked you'll need either the daemon disk, or to extract the CC: Tweaked daemon from the jar and drag it onto the computer.

Considerations:

• The mod is pretty much useless in a singleplayer world
• A dedicated server with a chunkloading mod is recommended (even if singeplayer)
• for access outside of your LAN, consider using a mesh VPN, such as Tailscale, or port forwarding. For public servers hosted at your home, use IP shielding local to you
• while the attack surface on the hosting hardware should (in principal, I won't leave the possibility out) be very limited. There can be in-game infrastructure attacks if you leave your websocket outputs without a password and the ID gets leaked, if both get leaked, or if whatever interface you made is publicly accessible and someone fools with it. Guard the interface with Tailscale over using port forwarding.
• attack surface can increase if the HTTP actuator is used for an Open Computer, especially when they fix the internet card on dedicated servers. Treat those like you would Government infrastructure and make sure no one in game can read the NBT off the actuator after it's set.
• at current, the CC: Tweaked <-> OC2 bridge is rather experimental. But you should also take care if you have a bridge setup. I don't think chunk claiming, such as FTB land claim, prevents CC: Tweaked stuff from being linked to a different computer. Guard any wireless network port blocks you have in a bridge setup.