Hi there,<\/p>\n
awesome coder TMRh20 did write some cool librarys for the widely used RF24 radio modules.
\nThese tiny things work with SPI and thanks to TMRh20s work, you can use them quite easily to connect two RPis.
\nYou can find his\/her Github on https:\/\/github.com\/TMRh20, as well as a lot of good documentation on his\/her blog http:\/\/tmrh20.blogspot.de\/ and github.io http:\/\/tmrh20.github.io\/<\/p>\n
To make it short and connect to RPis, this is my reciepe, worked out with TMRh20 - Thanks a lot!<\/p>\n
1.) You should connect the RF24 modules to your two RPis like shown here:
\nhttps:\/\/github.com\/TMRh20\/RF24Network\/tree\/Development#connection-info
\nI did not change anything in the config but did just connect the modules like mentioned in the table:<\/p>\n
Pins:<\/p>\n
PIN -- NRF24L01 -RPI ---------\tRPi -P1 Connector
\n1 ---- GND ----- rpi-gnd ----- (25)
\n2 ---- VCC ----- rpi-3v3 ----- (17)
\n3 ---- CE ------ rpi-gpio22 -- (15)
\n4 ---- CSN ----- rpi-gpio8 --- (24)
\n5 ---- SCK ----- rpi-sckl ---- (23)
\n6 ---- MOSI ---- rpi-mosi ---- (19)
\n7 ---- MISO ---- rpi-miso ---- (21)
\n8 ---- IRQ ---- - ------------- -<\/p>\n
2.) Install dependencies:
\nsudo apt-get install libboost1.50-all<\/p>\n
3.) Install RF24toTUN on all RPis
\nmkdir rf24
\ncd rf24
\nwget http:\/\/tmrh20.github.io\/RF24Installer\/RPi\/install.sh
\nchmod +x install.sh
\nsudo .\/install.sh<\/p>\n
Do you want to install the RF24 core library, Y\/N?Y
\nDo you want to install the RF24Network library?Y
\nDo you want to install the RF24Mesh library?Y
\nDo you want to install the RF24toTUN library?Y
\nDo you want to compile RF24toTUN with RF24Mesh support?N<\/p>\n
cd rf24libs\/RF24Network\/<\/p>\n
vi RF24Network_config.h
\nchange #define MAX_PAYLOAD_SIZE
\nto #define MAX_PAYLOAD_SIZE 1514<\/p>\n
sudo make install -B<\/p>\n
cd ..
\ncd RF24toTUN\/<\/p>\n
vi rf24totun.cpp
\ngoto line 209: while(!radioTxQueue.empty() ) { \/\/ && !radio.available() ) {
\nand change it to: while(!radioTxQueue.empty() && !radio.available() ) {<\/p>\n
sudo make install -B<\/p>\n
4.) Use the Tunnel on both RPis (you're in the RF24toTUN folder :)!):
\nNode 1, Master:
\nsudo rf24totun_configAndPing.sh 1 2
\nanswer 0 for Master
\ngot now IP: 192.168.1.1<\/p>\n
Node 2, Client:
\nrf24totun_configAndPing.sh 2 1
\nanswer 1 for Client
\ngot now IP: 192.168.1.2<\/p>\n
After that you can ping each other, even with -s100 for 108 bytes payload, or use ssh and such.<\/p>\n
Addition:
\nIf you want to use the LAN\/WAN Connection of the Master RPi from your Client, you need to do following:
\na) Master Site:
\nsudo sysctl -w net.ipv4.ip_forward=1
\nsudo iptables -t nat -A POSTROUTING -j MASQUERADE
\n# To forward and allow traffic, as mentioned here: http:\/\/tmrh20.github.io\/RF24Ethernet\/<\/p>\n
b) Client Site:
\nsudo route add default gw 192.168.1.1 tun_nrf24
\n# Configure default gateway to the IP of your Master RPi and use the RF24 device to connect to it<\/p>\n