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by fryderykchopin
Sat May 02, 2020 3:10 pm
Forum: Troubleshooting
Topic: Whole Wi-Fi network dropping because of USB adapter in RBPi?
Replies: 2
Views: 99

Re: Whole Wi-Fi network dropping because of USB adapter in RBPi?

donbrew wrote:
Sat May 02, 2020 2:23 pm
Are you using DHCP? If your Pi has a static address and that address is already in use there will be problems.
Yes I'm using DHCP. I have just checked my router's connected clients and all have different IP addresses/leases (even if they are turned off).
by fryderykchopin
Sat May 02, 2020 11:02 am
Forum: Troubleshooting
Topic: Whole Wi-Fi network dropping because of USB adapter in RBPi?
Replies: 2
Views: 99

Whole Wi-Fi network dropping because of USB adapter in RBPi?

I am using a Raspberry Pi 2B v1.1 (from February 2015) with an Edimax EW-7811UN Wi-Fi adapter (as this model doesn't have embedded Wi-Fi module) - with Raspbian Buster. I have noticed that from time to time my whole Wi-Fi network at home drops for no reason. All my devices (two laptops, smartphone, ...
by fryderykchopin
Sat May 02, 2020 10:49 am
Forum: General discussion
Topic: Cron not working when screen is blanked?
Replies: 12
Views: 411

Re: Cron not working when screen is blanked?

What is the program you are trying to run at 4pm ? PeterO The cron job just launches a program I have created in C. The program just retrieves some data from a website, does some stuff with it, shows some results in the screen, then sends me an email with the results. It is a simple C program in co...
by fryderykchopin
Sat May 02, 2020 10:48 am
Forum: General discussion
Topic: Cron not working when screen is blanked?
Replies: 12
Views: 411

Re: Cron not working when screen is blanked?

So I disabled screen blanking in the RPi configuration menu (Display tab) and now cron is working perfectly. I am not sure how but it seems that screen blanking interferes with the normal operation of the RPi (at least when a screen is connected). Anyway, disabling screen blanking solved the proble...
by fryderykchopin
Wed Apr 29, 2020 8:03 am
Forum: General discussion
Topic: Cron not working when screen is blanked?
Replies: 12
Views: 411

Re: Cron not working when screen is blanked?

So I disabled screen blanking in the RPi configuration menu (Display tab) and now cron is working perfectly. I am not sure how but it seems that screen blanking interferes with the normal operation of the RPi (at least when a screen is connected). Anyway, disabling screen blanking solved the problem.
by fryderykchopin
Tue Apr 28, 2020 6:49 pm
Forum: General discussion
Topic: Cron not working when screen is blanked?
Replies: 12
Views: 411

Cron not working when screen is blanked?

Hi folks, I am using cron for the first time. I found it easy to configure and apparently it works - but not always. I want to run a program every day at 4pm and I have scheduled that task with crontab -e. If I am using the RPi around 4pm, then cron works and it runs the program. However, let's say ...
by fryderykchopin
Tue Jul 09, 2019 9:28 am
Forum: Networking and servers
Topic: MQTT-SN over Bluetooth
Replies: 10
Views: 2298

Re: MQTT-SN over Bluetooth

Technically, TCP/IP is possible over Bluetooth using BNEP (Bluetooth Network Encapsulation Protocol.) I haven't played with it in years and years, but I assume you could use the Network Access Profile (NAP) to create a small Personal Area Network (PAN), and run MQTT over that. Again, I can't help, ...
by fryderykchopin
Tue Jul 09, 2019 9:24 am
Forum: Networking and servers
Topic: MQTT-SN over Bluetooth
Replies: 10
Views: 2298

Re: MQTT-SN over Bluetooth

Andyroo wrote:
Mon Jul 08, 2019 9:25 pm
The only thing I have ever seen on MQTT-SN is at http://www.steves-internet-guide.com/mqtt-sn/

Not sure if the Python code is of any use or not...
I think RSMB is designed to support UDP as well but I will double check. Thanks
by fryderykchopin
Mon Jul 08, 2019 6:29 pm
Forum: Networking and servers
Topic: MQTT-SN over Bluetooth
Replies: 10
Views: 2298

MQTT-SN over Bluetooth

So far I have been running some experiments with MQTT over WiFi using 3 Raspberry Pi's: MQTT publisher --> WiFi link --> MQTT Broker (mosquitto) --> Ethernet link --> MQTT subscriber I have been using mosquitto as the MQTT broker and the clients (publisher and subscriber) that come with it. Everythi...
by fryderykchopin
Tue Mar 26, 2019 4:39 pm
Forum: Networking and servers
Topic: Problem forcing a fixed WiFi data rate with hostapd.conf
Replies: 2
Views: 639

Re: Problem forcing a fixed WiFi data rate with hostapd.conf

I found the answer to my own question so I'll post it here in case this is helpful to anyone. https://superuser.com/questions/870779/iwlist-wlan0-bitrate-says-unknown-bit-rate-information 'iwlist'/'iwconfig' and similar tools can display bit-rate of an interface only when it is connected. When the i...
by fryderykchopin
Tue Mar 26, 2019 10:21 am
Forum: Networking and servers
Topic: Problem forcing a fixed WiFi data rate with hostapd.conf
Replies: 2
Views: 639

Re: Problem forcing a fixed WiFi data rate with hostapd.conf

Just an additional comment: If I use a WiFi scanner program in an external laptop it shows that the maximum bitrate of the network is correct, the one I expect. Moreover, I have noticed that if I run some traffic through the WiFi interface, then the bitrate returned by iwconfig wla0 is the correct o...
by fryderykchopin
Tue Mar 26, 2019 10:13 am
Forum: Networking and servers
Topic: Problem forcing a fixed WiFi data rate with hostapd.conf
Replies: 2
Views: 639

Problem forcing a fixed WiFi data rate with hostapd.conf

I have configured one laptop as a WiFi access point with hostapd in Raspbian Stretch (desktop version) and I have a number of RBPi's that connect to it, all runing Stretch as well. I am trying to run some experiments for different fixed bitrates in 802.11b and 802.11g. For the experiments in 802.11b...
by fryderykchopin
Wed Feb 20, 2019 4:55 pm
Forum: Networking and servers
Topic: Configure the Pi as wireless access point using both wireless/wired interfaces
Replies: 5
Views: 721

Re: Configure the Pi as wireless access point using both wireless/wired interfaces

Follow the 1st part of the document (routed setup); Bridging would put all the interfaces under the same bridge interface, you would have one single network, which is not what you want. You can skip the DNSmasq install part if you don't need DHCP or DNS services for your wifi network. (But why? If ...
by fryderykchopin
Wed Feb 20, 2019 3:47 pm
Forum: Networking and servers
Topic: Configure the Pi as wireless access point using both wireless/wired interfaces
Replies: 5
Views: 721

Re: Configure the Pi as wireless access point using both wireless/wired interfaces

Welcome to the Raspberry Pi forums. Raspberry Pi Foundation documentation here: https://www.raspberrypi.org/documentation/configuration/wireless/access-point.md Thanks for quick response! I tried this guide yesterday but I was unable to get it to work. Just two quick questions: - Because I plan to ...
by fryderykchopin
Wed Feb 20, 2019 10:33 am
Forum: Networking and servers
Topic: Configure the Pi as wireless access point using both wireless/wired interfaces
Replies: 5
Views: 721

Configure the Pi as wireless access point using both wireless/wired interfaces

Hello everyone, let's see if anyone could help me with this. I am using Raspbian Stretch (oficial image from June 2018) and I need to configure a RBPi 3B+ as follows: - It needs to use both wired (eth0) and wireless (wlan0) interfaces simultaneously. - Both interfaces need a static IP address, let's...

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