I'd like to know that a specific device (phone/tablet) has joined my WiFi network created by ESP8266 microcontroller. It shouldn't require any installed apps on that phone/tablet, if possible, to simplify the whole setup.
So I think I need to somehow identify connected clients, and MAC is not an option because it is subject to change randomly on, say, Apple devices.
Maybe it's possible to collect host names of connected clients?
I know that Windows and Ubuntu clients send their host names when getting IP from DHCP server (see here). Also, it's possible to find such information on, say, home Wi-Fi router admin web page (i.e. host names, their IPs and MACs).
I'm running DHCP server on ESP8266, but I haven't found any API that allows to get peer host name (i.e. reverse DNS). Does ESP8266 support getting such information?
Related
Currently my program use the IP of the other device in order to communicate over grpc.
Unfortunately the IP is changing all the time and I cannot continue the connection between the devices without updating it manually.
The connection between the devices is only on LAN and should blocked access from WAN.
Locking the IP of the device in the rowter settings is not an option this time.
Does grpc have a way to communicate over LAN (inside my network) using identification number or mac address that does not change over time?.
Related questions I found:
grpc: Identify clients from same IP address
Reason for both a MAC and an IP address
In order to locate a machine based on its MAC address, you are talking about implementing ARP. This is something that is not supported in dart nor am I sure it would be advisable to go this route anyway. If setting a DHCP reservation on your router is not an option, are you able to skip DHCP and set a static IP on the receiving machine?
You could look into dynamic DNS which your router may support, or you may need to set up separately, but that will also require a static IP (for your DDNS server). If your machines can connect to the internet there are many DDNS services you can sign up for, but it sounds like that is not the case.
I've got an app that supports Bonjour and manually connecting to an IP (all within the same local network). I'm now looking at whether I can use MPC instead and while it obviously would be able to replace Bonjour, I haven't seen anything that allows me to replace the functionality around manually connecting to the IP. For context, my app runs in networks that have multicast disabled which is when users fall back to manually entering the IP address.
I could have the receiving app host a webserver and send a request there. Could I create a Peer based on the ip:port combination? That would allow me to make use of MPC for the MCSession aspect.
Is it possible to set up a Multipeer Connection based on an ip:port rather than having it automatically discovered via multicast?
I'll go with a solution based on NWConnection which uses NWEndpoint and can be created with both IP:port and a Bonjour-established service.
If I would've had access to the full Network.framework then I could've used that for both discovery & communication but due to SDK constraints I'll be using MultipeerConnectivity for the discovery aspect instead. By providing the device its IP & port when broadcasting the Bonjour service, another device can discover it automatically and then use the extra info to create an IP:port-based NWConnection.
Would anyone like to help me with this problem please?
how to connect/control Nodemcu esp8266 wi-fi module from different network for control iot devices from outside of any home/ house?
Internet connection problem from different network for NodeMCU ESP8266 which I am using for IOT home automation.
Actually, in case of an class project, I have used some code (also coppied some code and took help from some website) from internet and also used Blynk for controll my ESP8266.
But not i want to make a personal app by which app I can control my devices outside from my home.
I have already connected with my WI-FI router with my home network!!
It worked well,
But i don't know how to do the same thing from different netwrok.
If possible I think anyone can help me....
Thank you.
To everyone.
This has been answered in greater detail on both the Arduino and Internet of Things StackExchange sites. In summary:
For safety, it is difficult to start a connection to a device on another local network. Devices on WiFi networks are protected from the Internet by a firewall, which is normally configured to return responses to requests sent by the devices, but block all unsolicited messages. Even if the firewall allows an incoming connection on a given port, "port forwarding" or other custom configurations are needed for unexpected messages to reach one of the multiple devices on the network (the devices usually share the same public IP address of the network and external systems' messages cannot reach the right local address without forwarding by the router).
Any device exposed to unsolicited requests like this is at risk of being attacked and can pose a risk to other systems on the network. It is thus safer to leave the firewall the same and instead make the device subscribe to an external webserver, which acts as a mailbox for incoming messages. Then, you can send requests to the server from anything with an internet connection, and the server will store them and relay them to the ESP8266 whenever the ESP asks. MQTT protocol using a server-side broker program like Mosquitto and a client like PubSubClient on your ESP8266 could work for this sort of publish-subscribe model, and MQTT tutorials and explanations are available both on both tool sites and Stack sites.
You can use Arduino IDE to program ESP8266 device.
https://randomnerdtutorials.com/how-to-install-esp8266-board-arduino-ide/
After installing ESP8266 in Arduino IDE. You need to connect ESP8266 with WiFi router(which have internet connected). Once your device is connected with a WiFi router. you can MQTT protocol to communicate with the server. You can use the following library in Arduino to implement MQTT client in ESP8266. ESP8266 is used to send and receive data from a different network. ESP8266 is subscribed to a particular topic. You can publish data to that topic from different MQTT client.
https://github.com/Imroy/pubsubclient
Use the Following link to get more familiar with MQTT protocol
https://www.hivemq.com/blog/mqtt-essentials-part-1-introducing-mqtt
You can use MQTTfx desktop application to send and receive data from NodeMcu(ESP8266).
MQTT basic diagram for understanding
I'm using Embarcadero RAD Studio Delphi XE8.
Multi-Device Application app tethering components are designed for traditional WiFi and Bluetooth coupling. Does it support also Internet connections?
I would like to try to make small p2p app. I'm using App tethering via Wifi but I would like to connect App tethering via internet connection.
how to do that ?
Taken from the documentation
Connecting to Applications Outside Your Subnet
By default, both AutoConnect and DiscoverManagers perform the
discovery on the subnet of the local area network (LAN) where the
device running your application is. However, you can use their
optional parameter Target to override this behavior, and specify an IP
address or subnet: To specify an IP address to search for remote
managers, specify that IP address as the Target. To specify a subnet
of IP addresses, specify an IP address with a 0 as its fourth number.
For example, if you specify "192.168.4.0" as the Target, your manager
searches the 192.168.4.x subnet for remote managers. Note: You can not
specify wider subnets. For example, "192.168.0.0" is not supported.
In other words you need to use the IP address as the optional ATarget parameter of the mentioned calls. The differences to local tethering are minor, which I guess is why there are not many examples.
See the Embarcadero web site for more details
Try VPN connect two device. If your 2 device is same vpn (For ex: Softether , Openvpn). you can discover other device around the world. (Dont forget enable vpn server settings to discover other devices options)
How can I programtically get the MAC address of WiFi router.
i want the command or the program in c which will list only the mac address of devices which are connected to the my WiFi router. it it possible to get when i know the IP address of the router?
Getting the MAC of the WiFi router on which you are connected (or try to connect) is probably possible if you have access to low level network frame.
Now it looks you are indeed willing to get the MAC of ALL the devices connected to the WiFi router, which is another thing ! Unless the router has some building functionality that gives you this list (like an HTML summary, I don't know if openWrt provide this), I don't think by running a program in C on a client, you would be able to get the MACs of other connected clients !
But in case the router as the information in an html page (eg : from a remote administration), you might try to simulate login to administration, get this page then parse the page to get the MACs... from a C prog..
Taking your problem from another side, if you have a wireless adapter you can set in monitor mode, you could sniff the wireless traffic on the channel(s) opened by your targeted WiFi router, and list the distinct client connected. Have a look to BackTrack's ssidsniff ?