wifi-connect | Easy WiFi setup for Linux devices
kandi X-RAY | wifi-connect Summary
kandi X-RAY | wifi-connect Summary
Easy WiFi setup for Linux devices from your mobile phone or laptop. WiFi Connect is a utility for dynamically setting the WiFi configuration on a Linux device via a captive portal. WiFi credentials are specified by connecting with a mobile phone or laptop to the access point that WiFi Connect creates. Download | How it works | Installation | Support | Roadmap.
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QUESTION
I use wifi-connect to configure my Raspberry Pi in unknown WLAN Networks.
wifi-connect works when I execute it via command line once the system booted, but when I put it into sudo crontab -e, it won't work. The cron logs show no errors. The autostart of my own scripts works.
My crontab: @reboot /usr/local/sbin/wifi-connect
Does someone have a hint for me why this does not work?
...ANSWER
Answered 2021-Jun-07 at 07:18Usually this kind of issues (when things works in a terminal but not in crontab), since there is nothing tricky in the crontab entry (you are just calling a executable with no arguments) are due to timing issue. Likely the crontab entry get executed before the network stack is ready. To do a quick test add a delay to that execution prepending sleep 60;
to your command, this will delay the execution of 1 minute, which should be enough. Anyway this is not a reliable solution, you will have to user a script o a service which actually check for the network stack.
QUESTION
My APP use WifiNetworkSpecifier to connect to a router.
And once connect to the router. APP called
connection_manager.BindProcessToNetwork(network);
After called this function. Even I turn off the WiFi. And turn on the mobile data.
The APP will not able to connect to internet anymore.
If this function is not called. APP will be able to connect to internet through mobile data.
What is the mechanism of BindProcessToNetwork()?
...ANSWER
Answered 2020-Nov-20 at 14:33Once BindProcessToNetwork
is called, ALL networking sockets are bound to that network for the lifecycle of that app (this is mainly a security feature so packets will not "leak" another network).
You can clear that network binding by calling BindProcessToNetwork
again, but passing in null
as your network type.
QUESTION
This post is related to ROS (Robot Operating System) and ESP8266, and has also been cross-posted on ROS Answers and Robotics Stack Exchange.
I've ROS Melodic running on a Raspberry Pi 4 and need to send out information (as strings) over wifi to multiple ESP8266. I'm only just starting so it's just one ESP8266 for now. For communication, I'm using socket_node
found in the ROS package rosserial_server
(package wiki).
Referring to the picture below, the slave node publishes to the topic /Topic_data_over_wifi
which is subscribed by a node running on the ESP8266:
The problem is, the node /rosserial_server_socket_node
remains floating!
I've double checked names of topics and IP addresses, and at one point, got the node /rosserial_server_socket_node
to actually link to the rest of the ROS network as shown in the "What I want" section. However, that was just one time (a fluke?) and never could I again get /rosserial_server_socket_node
to join the ROS network.
rosserial_server
's socket_node
is used with its default settings (port 11411). I did try other port numbers but there was no difference. After all nodes have been launched, here's the output of rostopic list
(other than the usual /rosout and /rosout_agg):
- /commands_from_master_node
- /topic_data_over_wifi
Goal: I need to find a way to connect the ESP8266 and the Raspberry pi 4 over wifi using ROS. More specifically, I need to get data from the slave node (on Raspberry Pi) to the node running on the ESP8266.
I've already looked at this multiple-TCP-connections post but didn't find anything that could solve my problem.
Any inputs/suggestions will be very appreciated.
...ANSWER
Answered 2020-Sep-15 at 11:37Depending on the software running on the ESPs, it might be an option to use the ROS MQTT bridge. The downside is that you will need an additional MQTT broker (I am not sure, but as I recall mqtt_bridge is an MQTT client and requires a broker like Mosquitto). You can add MQTT clients to the ESPs and connect them to the same broker and subscribe to MQTT messages. In other words, you create a MQTT network for the ESPs with their borker and add ROS to that network, via mqtt_bridge. If you are not running ROS specific software on the ESPs it should work fine.
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