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by mlp6868
Sun Dec 27, 2020 12:51 am
Forum: Networking and servers
Topic: RPI as WiFi AP, SSID there but no IP
Replies: 3
Views: 343

Re: RPI as WiFi AP, SSID there but no IP

Not sure if what you got so far helps you. I like to run dhcpd instead of dnsmasq, but it's all the same. I run such APs in may places.

If you are still stuck, for us to help you, let us see the output of your "ifconfig -a" command. we can help you...

- mlp
by mlp6868
Sun Dec 27, 2020 12:36 am
Forum: Networking and servers
Topic: Port Fowarding with MotionEyeOS
Replies: 1
Views: 113

Re: Port Fowarding with MotionEyeOS

I see that you didn't get any answers - it is both easy to do, and yet you shouldn't "just do it" but play it safe. Read below. I'm running just "motion", not the MotionEye add-on; good enough for my surveillance cameras' needs. Motion provides a live video stream on port 8081, u...
by mlp6868
Thu Dec 10, 2020 2:26 am
Forum: Networking and servers
Topic: Accessing raspberry through SSH
Replies: 6
Views: 627

Re: Accessing raspberry through SSH

I posted some debugging instructions for that exact scenario in a recent thread (https://www.raspberrypi.org/forums/viewtopic.php?f=36&t=291590&p=1763721#p1763721). It comes down to checking that your remote connection attempt really makes it to your Pi. First I would assume that you service...
by mlp6868
Thu Dec 10, 2020 1:36 am
Forum: Automation, sensing and robotics
Topic: Wiring 10x DS18B20 probes on a breadboard
Replies: 6
Views: 440

Re: Wiring 10x DS18B20 probes on a breadboard

I run 4 sensors on 3m of cable with no decoupling at all. I'm, with pootle here - I did 8 x 4m, all together on the standard GPIO pin, no special add-ons except that I lowered the bias resistor to 330. I'd say, go with the easiest first and add more stuff as needed, better than anticipating the wor...
by mlp6868
Mon Nov 23, 2020 1:01 pm
Forum: Automation, sensing and robotics
Topic: Controlling Heating System with Raspberry Pi
Replies: 2
Views: 233

Re: Controlling Heating System with Raspberry Pi

Presumably the system already comes with a thermostat arrangement? In all systems that I have encountered so far, the thermostat just connects two contacts, and the heat turns on. I had a place with circulation pumps, and now one with a combined heat/AC unit. So all you need is to equip a Pi with a ...
by mlp6868
Thu Nov 19, 2020 1:31 pm
Forum: Networking and servers
Topic: Connecting to RPI thru telnet (not LAN)
Replies: 2
Views: 203

Re: Connecting to RPI thru telnet (not LAN)

of couser the SHH is opened, even I'm able to connect to the rpi thru VNC but not thru ssh or telnet Let's forget telnet as B.Goode says, and he is also right that many ISPs block incoming connections. But the way I parse the quoted sentence is that even on your LAN, where you connect ok via VNC, y...
by mlp6868
Fri Nov 06, 2020 1:47 pm
Forum: Automation, sensing and robotics
Topic: Controlling existing HVAC Zone Relays
Replies: 4
Views: 368

Re: Controlling existing HVAC Zone Relays

I use DS18B20 "one wire" digital temp sensors, either on a Pi where convenient, else on a ESP8266 (I have also posted a pic in one of the threads here).
- mlp
by mlp6868
Thu Nov 05, 2020 10:26 pm
Forum: Networking and servers
Topic: Packet sniffing
Replies: 7
Views: 530

Re: Packet sniffing

@mlp can you give me some masquerading examples (for this no-internet setup)? google is your friend here, but here is what I consider the easiest/most minimalist setup (and read below what is missing). This is conceptually no different from your home router that takes you upstream internet connecti...
by mlp6868
Tue Nov 03, 2020 1:21 pm
Forum: Automation, sensing and robotics
Topic: Controlling existing HVAC Zone Relays
Replies: 4
Views: 368

Re: Controlling existing HVAC Zone Relays

Actually I had the exact same furnace control unit at my old place (I moved away a year ago). Inside are 3 relais that are normally switched by the thermostats by simply connecting two contacts. Those relais then (in my case) turn on and off individual circulation pumps. All it takes is to equip a P...
by mlp6868
Tue Nov 03, 2020 1:58 am
Forum: Networking and servers
Topic: Packet sniffing
Replies: 7
Views: 530

Re: Packet sniffing

I second the statement that this is overly complicated. I also didn't know that you could just have a bridge interface without assigning it an IP in it own right - I mean, how do you access the MITM Pi? And iptables won't do much for you, because this bridging happens at the ethernet protocol level,...
by mlp6868
Mon Nov 02, 2020 12:36 am
Forum: Deutsch
Topic: SSH Zugriff schließt nach Passworteingabe
Replies: 6
Views: 549

Re: SSH Zugriff schließt nach Passworteingabe

Ich habe oft so ssh Zugangsprobleme zu lösen... Wenn gar nichts hilft, mach ich folgendes. Ich nehme an dass du vom Monitor noch in den Pi reinkommst, d.h,. dass er nicht headless ist, ja? Also log dich ein, werde root - sudo -s (ist bequemer als 20 mal "sudo" zu tippen...) Dann: /usr/sbin...
by mlp6868
Mon Nov 02, 2020 12:06 am
Forum: Networking and servers
Topic: HELP Ideas needed for transferring data
Replies: 11
Views: 511

Re: HELP Ideas needed for transferring data

It is also considered a very good practice to set up key-based authentication, using good passphrase on each SSH key Indeed, it is among the most secure and at the same time most convenient access methods. Let me chime in here and explain in a bit more detail. Because what we want to accomplish her...
by mlp6868
Sun Nov 01, 2020 3:46 am
Forum: Automation, sensing and robotics
Topic: Pi+Lirc: Devices not responding to irsend
Replies: 11
Views: 710

Re: Pi+Lirc: Devices not responding to irsend

I know that transmitters/receivers come in different frequencies. Could it be that ? Probably not. I don't think you said what hardware you are using, so it's hard to say anything definitive. There are two frequencies involved. One is the, for a lack of a better word, base frequency of the macrosco...
by mlp6868
Wed Oct 28, 2020 5:44 am
Forum: Automation, sensing and robotics
Topic: Pi+Lirc: Devices not responding to irsend
Replies: 11
Views: 710

Re: Pi+Lirc: Devices not responding to irsend

Ok, that's odd, because I'm controlling most of my devices this way, through an irrecord'ed config file. In /etc/lirc/lirc_options.conf, what have you set as driver value? The default used to be "devinput", but it needs to be "default": [lircd] nodaemon = True driver = default de...
by mlp6868
Mon Oct 26, 2020 9:51 pm
Forum: Automation, sensing and robotics
Topic: Pi+Lirc: Devices not responding to irsend
Replies: 11
Views: 710

Re: Pi+Lirc: Devices not responding to irsend

First, it never occurred to me to use a camera to visualize the IR flashes, good idea! (I put the IR-LEDs on sockets and can swap them out with standard LEDs to see that they light up). I take it that you downloaded the lirc.conf code definitions from somewhere. I have seen this that the frequency b...
by mlp6868
Wed Oct 21, 2020 10:09 pm
Forum: Deutsch
Topic: Alarmanzeige mit Steuerung für FFW
Replies: 2
Views: 449

Re: Alarmanzeige mit Steuerung für FFW

Hm, ich sehe was du da machen willst... Doch halt, was ist wenn mal keiner zum Alarm kommt, kann auf dem Dorf unter der Woche schon vorkommen, Na da weiss ich nicht ob ich bei euch im Dorf mein Haus haben wollte... "Wenn es bei Ihnen brennt, pressen Sie bitte die Eins..." :D Ich würde dem ...
by mlp6868
Tue Oct 20, 2020 10:24 pm
Forum: Automation, sensing and robotics
Topic: connecting sensors to raspberry pi
Replies: 2
Views: 205

Re: connecting sensors to raspberry pi

You could start with a simple one - I always get my students started with a DS18B20 temperature sensor. You'll find plenty of references here in this forum (some of them from me) and also outside. The other easy starter is an infrared receiver that allows you to decode pretty much any IR remote's co...
by mlp6868
Tue Oct 20, 2020 12:43 am
Forum: Networking and servers
Topic: Help With Nextcloud
Replies: 5
Views: 256

Re: Help With Nextcloud

Sorry I didn't quite see that there was additional text... Port forwarding does not work for me. I'll explain how wifi routers in my house area: Wire comes in to basement and goes into Xfinity Xfi modem/router (sadly only xfinity is available in my area, literally the worst internet provider ever), ...
by mlp6868
Tue Oct 20, 2020 12:16 am
Forum: Networking and servers
Topic: Help With Nextcloud
Replies: 5
Views: 256

Re: Help With Nextcloud

I'm running my in-house NextCloud on an actual PC, not a Pi... I think it might be a bit underpowered, but give it a shot. It depends a bit on how much you use it. I mostly use my setup to synchronize pictures taken with my phone. But with modest use, I see no reason why a Pi shouldn't be able to ha...
by mlp6868
Mon Oct 19, 2020 12:13 pm
Forum: C/C++
Topic: Need help with function call that needs: const char *text
Replies: 3
Views: 299

Re: Need help with function call that needs: const char *text

Yes, that would work, but in general, it is probably easier to use the STL "to_string" function. Then you don't have to worry about the length of the string, and it works for any type of number variable, int, float, double... std::to_string returns a std::string, which you need to convert ...
by mlp6868
Sun Oct 18, 2020 10:48 pm
Forum: Automation, sensing and robotics
Topic: Raspberry pi 3b+ send sensor data over usb/ip
Replies: 3
Views: 188

Re: Raspberry pi 3b+ send sensor data over usb/ip

Ok, the MQTT probably needs a bit of explanation. While it is a good, standard approach, I think it still has a good amount of learning curve to it, especially since you say that you don't know where to start. In very broad strokes, you run a MQTT server that receives data tagged in a certain way fr...
by mlp6868
Sun Oct 18, 2020 3:16 pm
Forum: Automation, sensing and robotics
Topic: network thermometer
Replies: 3
Views: 294

Re: network thermometer

What comes closest for me is a ESP8266 with a DS18B20 temperature sensor attached. Yes, you will need a soldering iron to attach one resistor, but it's dirt simple. The 'B20 has 0.5C accuracy. The ESP8266 has wireless built in and so you can deploy it anywhere in your wireless range. Both together c...
by mlp6868
Sun Oct 18, 2020 2:41 pm
Forum: Networking and servers
Topic: Raspberry Pi Fleet Update Management
Replies: 3
Views: 282

Re: Raspberry Pi Fleet Update Management

I don't know PInet, but have used puppet, and moved to Ansible (not for a collection PIs, but the management of clusters). Not sure where the info about "PXE booting" comes from - of course you can boot this way, but that's not what it's about. (None of my machines PXE-boots). Both systems...
by mlp6868
Fri Oct 16, 2020 2:26 am
Forum: General discussion
Topic: Security as a Router
Replies: 20
Views: 982

Re: Security as a Router

geffers wrote: ↑ Thu Oct 08, 2020 5:19 am What I find fascinating is how the router and firewall tasks appear to overlap. To operate a server behind a router you have to open a port and redirect it to the server but, if I understand correctly, the 'Internet of Things' seem to open a server (eg. IP ...
by mlp6868
Thu Oct 15, 2020 10:02 pm
Forum: Networking and servers
Topic: Ethernet connection to a Test Instrument
Replies: 6
Views: 289

Re: Ethernet connection to a Test Instrument

Good advice, however, the Rigol, without a keyboard, takes a good amount of fiddling setting a static IP (I'm more familiar with their scopes). It's easy to assign a static IP on the Pi, just as pcmanbob suggests, like 192.168.1.5. Then you run a DHCP server on the Pi, serving the wired interface on...

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