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Hi, I am trying to simply detect specific signal at specific frequency (as a start) then send signal from raspberry pi to arduino to trigger other command. From my research I found GRC as best option with hackRF one. I got the signal at monitor as below but as I am totally new in GRC I don’t know which blocks can detect the signal, I think the best way is to record the signal in file then detecting it in future using kind of comparison or by measuring the power. Please help me to choose appropriate blocks to achieve this result

So I have been working on this Server/VPN project for about a month now and I'm supper happy i finally have everything together, setup and boxed up. A quick rundown on what is in there and what i have done. The top black box is clearly just my router and the bottom hosing is an electronic project box i picked up for my local electronics store (Jaycar). The actual internals consist of 3 raspberry pi 3's, a TP 5 port switch which i removed the housing from as the board by itself takes up significantly less room, a 70 watt powered USB hub to power the pi's, 3 micro USB power cables, 3 cat 5e Ethernet cables, and a 2TB external hard drive. The standalone raspberry pi with the 2TB external drive is a self contained, fully functional, and port forwarded for external access, OwnCloud server which i have found myself using on a dally basis. The other 2 that are stack, are VPN related. The bottom pi is my own OpenVPN household server which is port forwarded for external access and it is what i actually connect all of my devices to. The top pi is my NordVPN client that i have also set up as a local internet gateway for my local network. So the config currently works and is setup as follows. My OwnCloud server stands allow with internal pi encryption, https, and encrypted storage. The OpenVPN local server runs all of its encrypted traffic through the NordVPN pi gateway, then through to my router, while still encrypted out to the NordVPN servers and then finally decrypted and out to the internet with a change of location and ip address. Device --> OpenVPN pi Server --> NordVPN pi Client --> Router --> NordVPN Server --> Internet The theory behind this is now i can create and revoke as many client keys as I want and keep track of all of my devices with my own OpenVPN server as well as encrypting my traffic while i am way from home without setting up all of my devices with NordVPN (its all most as simple as drag and drop a ovpn file for most devices using OpenVPN plus OpenVPN can be setup in may different ways and has loads more configuration options), but then also tunnel them out through the internet while maintaining the encryption (instead of decrypt all of my traffic before it leaves my router) as well as changing my geo-location, hiding my traffic from my ISP and also avoiding the 8 device limit that NordVPN sets. Thought? Hope i Have sparked some creativity in everyone.

So I really need help, I though I had everything squared up and ready but I tried to connected externally this afternoon and found a large hole in my plan (a little cranky) . I have everything working great but external access to my OpenVPN server. For more information please read the below link https://forums.hak5.org/index.php?/topi ... vpn-build/ Long story short I need to access my server from outside the network. The setup is my open VPN server on a raspberry pi running raspbian which is on local ip 10.1.1.101 and I run all of its traffic through another raspberry pi configured as a gateway with the ip of 10.1.1.102 then out to the Internet. Everything is working great internally I just need to know what I have to do to access it external. The default gateway for the gateway pi is 10.1.1.1