Stable Branch
A full serial line connection between 2 devices using LoRa. Currently the code is set up for 1200bps with a 250bytes buffer, in theory we should be able to get up to 2000bps safely without extra buffering code that i would need to figure out first. Though Linux console only works at 300bps currently (not yet sure why)
The hardware is 2 pairs of a Wemos ESP8266 module connected to a Ra-02 SX1278 module with the following pin connection
| NodeMCU Pins | SX1278 Pins |
|---|---|
| GND | GND |
| 3.3V | VCC |
| D8 | NSS |
| D7 | MOSI |
| D6 | MISO |
| D5 | SCK |
| D0 | RST |
- Connect your LoRa module according to the above configuration or reconfigure with your own setup
- Clone the repo (or just the one ino file)
- Upload the code to one of the modules, this module will be the host
- Comment out the
#define SoLR_HOSTLine, and Upload that to the second module. This module will be the client - Connect both modules to a serial terminal and if they connected properly you can start sending text/data between the 2 modules
- Address Filtering
- Encryption
- Error Correction
- Resending (most) Lost Packets
- Re-Configuration Packets (to change configuration on the fly)
- Secondary Serial connection for control and configuration? (using SoftwareSerial)
- Make it compatible with the Arduino Serial library with Stream methods
- The damn thing transmits 100% of the time and basically just jams the 433mhz frequency.
- Some reliability problem like random crashes etc.
- Linux console doesnt seem to work at baud rates other than 300bps. I tested 600 and 1200 bps and it seems to just be sending/receiving garbled data. But even at 300bps, its actually not super terrible. Though regular data/text transmission seem to work perfectly at these higher baud rates, even when both sides have data being sent at the same time.
Command I used to run a linux shell/console on a ttyUSB:
sudo getty -L **baudrate** **tty** **terminal type** -8 -a **username**
For example:
sudo getty -L 600 ttyUSB0 vt102 -a adminispwd