I have attached my current sample code to send and receive. It makes use of the Arduino LoRa Library by Sandeep Mistry and displays RSSI and SNR of the received data.
The very versatile RadioHead RF95 Library also works now without additional tweaks! You need at least version 1.80. Prior versions failed to compile (missing atomic.h).
Since these modules don't have a tcxo, there is a slight frequency mismatch. RadioHeads 'frequencyError()' tells me, the relative offset between my modules to be roughly approx. 1.5kHz.
[05.02.2018] Product update:
TTGO just recently released an upgrade to their popular LoRA Modules, referred to as V2.0. This board is supposed to be superior in design for both bands (433MHz and 868/915MHz).
New features include:
- microSD-Card Slot
- USB Port moved to the side
- shielded SX127x RF section
- new positioned WiFi antenna (the previous version sufferd from a poor design!)
- battery switch
Check out the V2.0 series at http://s.click.aliexpress.com/e/vB2rnmu
product update: TTGO finally offers a 3d printed case/shell for the ESP32 Lora Module. Available in black or white.
A new case design by [klkl] just (November, 26.) popped up on thingiverse:
Not sure if that one has enough space for a LiPo Battery beneath the module. Since it's tagged 'work in progress', details and features might yet be optimized...
There's a nice case created by Aleksei Golikov / lexgol for the heltec Wifi LoRa 32 board: https://makerware.thingiverse.com/thing:2581459
Just download the files and have it printed yourself.