Hi I’m trying to get my first Lora node connected to my RAK gate way, and I need some help.
I’m using the LmiC code and everything seems to work however I don’t have the Device EUI,
how can I get this from the Heltec Board? The board got an LCD so I can printe it to that.
Also is there a way to confirm that I’m transmitting on 915 AU.
I can see on the TCP dump on my gateway that I receive some packets but not able to see anything on the ThingsNetwork.
Thank you for your help
I’m also coding with mixed arduino (for LMiC) and ESP32 IDF, using platformIO on Visual Studio Code.
Had some trouble with race conditions, too. Not sure if i really cleared them.
Could you share your code here or on github?
I’m looking for a solution to switch off core 1. In ESP-IDF this is done with a build option, but doen’t work on arduino framework, probably because it uses precompiled ESP32 libs. Any ideas how to switch off core 1 in platformIO?
Great thread. Thanks to everyone who shared information. It’s gotten me almost the whole way.
I’m running the Heltec at 915 MHz, and have adjusted my arduino-lmic library config.h to reflect this. I’m running @nicbkw example code, but can’t get past “EV_JOIN_FAILED”
I see OTAA join requests up at TTN, and my APPEUI, DEVEUI are in LSB format, and APPKEY is in MSB format. All looks good, but I just still get stuck at the ev join failed message.
Any ideas on what I might be missing?
Ok, I plugged in my second module and it works fine. I’m guessing I have a bad board.
Guys, this is a great thread, but I need you help.
I have a ESP32 dev module with a Adafruit RFM95W breakout and I can’t get it to work, neither OTAA or ABP.
I used the examples from the arduino-lora repo… with OTAA, I always get the EV_JOIN_FAILED and with ABP it seems that the message goes out but I don’t see any activity on TTN.
Here is my prototype:
The big question is… EV_TXCOMPLETE (using ABP) means that my wiring between the ESP32 and the RFM95w module is working? Is this maybe a configuration error?
Thanks in advance!
PD: Here is my gateway:
You can’t; the board does not provide one.
You could generate a semi-random one yourself (possibly based on the onboard WiFi’s MAC address), see DevEUI for non-hardware assigned values for rules to take into account. Or simply have TTN Console generate one for you by clicking the 
icon at the start of the input field; see screenshots and a warning at the same link.
I have one Heltec board working properly, and one not working with LMiC, too. That one not working has issues when data is to be transmitted.
Found out that one working has a CPU ESP32 Hw Revision 1, while that one not working has a CPU ESP32 Hw Revision 0.
Can you check this with your boards, please? Perhaps this is the reason, eventually timings or something else on the SPI interface between ESP32 and SX1276 goes wrong.
You can see the CPU revision when flashing with esptool, it shows CPU type and revision.
There are some bugs reported for CPU ESP32, esp. for revision 0.
Greetings, @Verkehrsrot -
it looks like I have two Rev 1 boards.
.\Documents\Arduino\hardware\heltec\esp32\tools>esptool -p com9 -b 115200 flash_id
esptool.py v2.1
Connecting....
Detecting chip type... ESP32
Chip is ESP32D0WDQ6 (revision 1)
Uploading stub...
Running stub...
Stub running...
Manufacturer: ef
Device: 4016
Detected flash size: 4MB
Hard resetting...
.\Documents\Arduino\hardware\heltec\esp32\tools>esptool -p com9 -b 115200 flash_id
esptool.py v2.1
Connecting....
Detecting chip type... ESP32
Chip is ESP32D0WDQ6 (revision 1)
Uploading stub...
Running stub...
Stub running...
Manufacturer: ef
Device: 4016
Detected flash size: 4MB
Hard resetting...
.\Documents\Arduino\hardware\heltec\esp32\tools>
I’ve noticed that I don’t have consistent performance on my second board either, to my local RAK831 gateway. So, I’m not out of the woods yet.
I need some help trying to connect my Helltec board to my RAK 831 Gatway.
I’m using the Lmic source in the Arduino environment.
Here is my code
Hi I was wondering if you know of a working Heltec configuration on the AUS915 spectrum.
I set up a gateway in Mount Kuring Gai and it is connected to the The Thingsnetwork.
But I’m having a bit of a hard time to get the node I have configured.
I have a Helltec board and using the Arduino Core Lmic.
However I fail to register EV_JOIN_FAILD.
Find the code and the serial window output from the Arduino IDE.
May thanks for your help.
Here is the code I’m using:
// This should also be in little endian format, see above.
static const u1_t PROGMEM DEVEUI[8] = { 0x9B, 0xF6, 0x59, 0x64, 0x71, 0xFB, 0x02, 0x00 };
void os_getDevEui (u1_t* buf) {
memcpy_P(buf, DEVEUI, 8);
}
// This key should be in big endian format (or, since it is not really a
// number but a block of memory, endianness does not really apply). In
// practice, a key taken from ttnctl can be copied as-is.
// The key shown here is the semtech default key.
static const u1_t PROGMEM APPKEY[16] = { 0xA9, 0x43, 0xB5, 0x11, 0xEB, 0xFB, 0xA5, 0xC1, 0xB7, 0xA1, 0x42, 0xBC, 0x7E, 0xB4, 0x7C, 0x79 };
void os_getDevKey (u1_t* buf) {
memcpy_P(buf, APPKEY, 16);
}
static uint8_t mydata[] = “Hi”;
static osjob_t sendjob;
// Schedule TX every this many seconds (might become longer due to duty
// cycle limitations).
const unsigned TX_INTERVAL = 30;
// Pin mapping
const lmic_pinmap lmic_pins = {
.nss = 18,
.rxtx = LMIC_UNUSED_PIN,
.rst = 14,
.dio = {26, 33, 32},
};
void onEvent (ev_t ev) {
Serial.print(os_getTime());
u8x8.setCursor(0, 5);
u8x8.printf(“TIME %lu”, os_getTime());
Serial.print(": ");
switch (ev) {
case EV_SCAN_TIMEOUT:
Serial.println(F(“EV_SCAN_TIMEOUT”));
u8x8.drawString(0, 7, “EV_SCAN_TIMEOUT”);
break;
case EV_BEACON_FOUND:
Serial.println(F(“EV_BEACON_FOUND”));
u8x8.drawString(0, 7, “EV_BEACON_FOUND”);
break;
case EV_BEACON_MISSED:
Serial.println(F(“EV_BEACON_MISSED”));
u8x8.drawString(0, 7, “EV_BEACON_MISSED”);
break;
case EV_BEACON_TRACKED:
Serial.println(F(“EV_BEACON_TRACKED”));
u8x8.drawString(0, 7, “EV_BEACON_TRACKED”);
break;
case EV_JOINING:
Serial.println(F(“EV_JOINING”));
u8x8.drawString(0, 7, “EV_JOINING”);
break;
case EV_JOINED:
Serial.println(F(“EV_JOINED”));
u8x8.drawString(0, 7, "EV_JOINED ");
// Disable link check validation (automatically enabled
// during join, but not supported by TTN at this time).
LMIC_setLinkCheckMode(0);
break;
case EV_RFU1:
Serial.println(F(“EV_RFU1”));
u8x8.drawString(0, 7, “EV_RFUI”);
break;
case EV_JOIN_FAILED:
Serial.println(F(“EV_JOIN_FAILED”));
u8x8.drawString(0, 7, “EV_JOIN_FAILED”);
break;
case EV_REJOIN_FAILED:
Serial.println(F(“EV_REJOIN_FAILED”));
u8x8.drawString(0, 7, “EV_REJOIN_FAILED”);
//break;
break;
case EV_TXCOMPLETE:
Serial.println(F(“EV_TXCOMPLETE (includes waiting for RX windows)”));
u8x8.drawString(0, 7, “EV_TXCOMPLETE”);
digitalWrite(BUILTIN_LED, LOW);
if (LMIC.txrxFlags & TXRX_ACK) {
Serial.println(F(“Received ack”));
u8x8.drawString(0, 7, “Received ACK”);
}
if (LMIC.dataLen) {
Serial.println(F(“Received “));
u8x8.drawString(0, 6, “RX “);
Serial.println(LMIC.dataLen);
u8x8.setCursor(4, 6);
u8x8.printf(”%i bytes”, LMIC.dataLen);
Serial.println(F(” bytes of payload”));
u8x8.setCursor(0, 7);
u8x8.printf(“RSSI %d SNR %.1d”, LMIC.rssi, LMIC.snr);
}
// Schedule next transmission
os_setTimedCallback(&sendjob, os_getTime() + sec2osticks(TX_INTERVAL), do_send);
break;
case EV_LOST_TSYNC:
Serial.println(F(“EV_LOST_TSYNC”));
u8x8.drawString(0, 7, “EV_LOST_TSYNC”);
break;
case EV_RESET:
Serial.println(F(“EV_RESET”));
u8x8.drawString(0, 7, “EV_RESET”);
break;
case EV_RXCOMPLETE:
// data received in ping slot
Serial.println(F(“EV_RXCOMPLETE”));
u8x8.drawString(0, 7, “EV_RXCOMPLETE”);
break;
case EV_LINK_DEAD:
Serial.println(F(“EV_LINK_DEAD”));
u8x8.drawString(0, 7, “EV_LINK_DEAD”);
break;
case EV_LINK_ALIVE:
Serial.println(F(“EV_LINK_ALIVE”));
u8x8.drawString(0, 7, “EV_LINK_ALIVE”);
break;
default:
Serial.println(F(“Unknown event”));
u8x8.setCursor(0, 7);
u8x8.printf(“UNKNOWN EVENT %d”, ev);
break;
}
}
void do_send(osjob_t* j) {
// Check if there is not a current TX/RX job running
if (LMIC.opmode & OP_TXRXPEND) {
Serial.println(F(“OP_TXRXPEND, not sending”));
u8x8.drawString(0, 7, “OP_TXRXPEND, not sent”);
} else {
// Prepare upstream data transmission at the next possible time.
LMIC_setTxData2(1, mydata, sizeof(mydata) - 1, 0);
Serial.println(F(“Packet queued”));
u8x8.drawString(0, 7, “PACKET QUEUED”);
digitalWrite(BUILTIN_LED, HIGH);
}
// Next TX is scheduled after TX_COMPLETE event.
}
void setup() {
Serial.begin(115200);
u8x8.begin();
u8x8.setFont(u8x8_font_chroma48medium8_r);
u8x8.drawString(0, 1, “LoRaWAN LMiC”);
SPI.begin(5, 19, 27);
// LMIC init
os_init();
// Reset the MAC state. Session and pending data transfers will be discarded.
LMIC_reset();
// Start job (sending automatically starts OTAA too)
do_send(&sendjob);
pinMode(BUILTIN_LED, OUTPUT);
digitalWrite(BUILTIN_LED, LOW);
}
And this is the serial output from the Arduino IDE
ets Jun 8 2016 00:22:57
rst:0x1 (POWERON_RESET),boot:0x17 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0018,len:4
load:0x3fff001c,len:956
load:0x40078000,len:0
load:0x40078000,len:13076
entry 0x40078a58
RXMODE_RSSI
39430: engineUpdate, opmode=0x8
Packet queued
42206: EV_JOINING
46471: engineUpdate, opmode=0xc
46504: TXMODE, freq=902300000, len=23, SF=7, BW=125, CR=4/5, IH=0
362894: RXMODE_SINGLE, freq=923300000, SF=7, BW=500, CR=4/5, IH=0
426139: RXMODE_SINGLE, freq=923300000, SF=12, BW=500, CR=4/5, IH=0
428712: engineUpdate, opmode=0xc
439700: engineUpdate, opmode=0xc
439725: TXMODE, freq=903000000, len=23, SF=8, BW=500, CR=4/5, IH=0
754027: RXMODE_SINGLE, freq=923300000, SF=7, BW=500, CR=4/5, IH=0
817271: RXMODE_SINGLE, freq=923300000, SF=12, BW=500, CR=4/5, IH=0
819844: engineUpdate, opmode=0xc
907207: engineUpdate, opmode=0xc
907232: TXMODE, freq=911900000, len=23, SF=8, BW=125, CR=4/5, IH=0
1226861: RXMODE_SINGLE, freq=923300000, SF=8, BW=500, CR=4/5, IH=0
1290082: RXMODE_SINGLE, freq=923300000, SF=12, BW=500, CR=4/5, IH=0
1292654: engineUpdate, opmode=0xc
1332794: engineUpdate, opmode=0xc
1332819: TXMODE, freq=903000000, len=23, SF=8, BW=500, CR=4/5, IH=0
1647121: RXMODE_SINGLE, freq=923300000, SF=7, BW=500, CR=4/5, IH=0
1710366: RXMODE_SINGLE, freq=923300000, SF=12, BW=500, CR=4/5, IH=0
1712938: engineUpdate, opmode=0xc
2169543: engineUpdate, opmode=0xc
2169568: TXMODE, freq=912500000, len=23, SF=9, BW=125, CR=4/5, IH=0
2495037: RXMODE_SINGLE, freq=925100000, SF=9, BW=500, CR=4/5, IH=0
2558209: RXMODE_SINGLE, freq=923300000, SF=12, BW=500, CR=4/5, IH=0
2560782: engineUpdate, opmode=0xc
2571713: engineUpdate, opmode=0xc
2571738: TXMODE, freq=907800000, len=23, SF=8, BW=500, CR=4/5, IH=0
2886040: RXMODE_SINGLE, freq=925100000, SF=7, BW=500, CR=4/5, IH=0
2949284: RXMODE_SINGLE, freq=923300000, SF=12, BW=500, CR=4/5, IH=0
2951859: engineUpdate, opmode=0xc
3188834: engineUpdate, opmode=0xc
3188859: TXMODE, freq=906700000, len=23, SF=10, BW=125, CR=4/5, IH=0
3524727: RXMODE_SINGLE, freq=926900000, SF=10, BW=500, CR=4/5, IH=0
3587804: RXMODE_SINGLE, freq=923300000, SF=12, BW=500, CR=4/5, IH=0
3590376: engineUpdate, opmode=0xc
3613090: engineUpdate, opmode=0xc
3613115: TXMODE, freq=912600000, len=23, SF=8, BW=500, CR=4/5, IH=0
3927417: RXMODE_SINGLE, freq=926900000, SF=7, BW=500, CR=4/5, IH=0
3990661: RXMODE_SINGLE, freq=923300000, SF=12, BW=500, CR=4/5, IH=0
3993234: EV_JOIN_FAILED
3998768: engineUpdate, opmode=0xc
4250120: engineUpdate, opmode=0xc
4250148: TXMODE, freq=911900000, len=23, SF=10, BW=125, CR=4/5, IH=0
4586017: RXMODE_SINGLE, freq=923300000, SF=10, BW=500, CR=4/5, IH=0
4649093: RXMODE_SINGLE, freq=923300000, SF=12, BW=500, CR=4/5, IH=0
4651665: engineUpdate, opmode=0xc
4666741: engineUpdate, opmode=0xc
4666766: TXMODE, freq=903000000, len=23, SF=8, BW=500, CR=4/5, IH=0
4981070: RXMODE_SINGLE, freq=923300000, SF=7, BW=500, CR=4/5, IH=0
5044313: RXMODE_SINGLE, freq=923300000, SF=12, BW=500, CR=4/5, IH=0
5046886: EV_JOIN_FAILED
5052402: engineUpdate, opmode=0xc
5164684: engineUpdate, opmode=0xc
5164711: TXMODE, freq=908700000, len=23, SF=10, BW=125, CR=4/5, IH=0
5500581: RXMODE_SINGLE, freq=923300000, SF=10, BW=500, CR=4/5, IH=0
5563657: RXMODE_SINGLE, freq=923300000, SF=12, BW=500, CR=4/5, IH=0
5566229: engineUpdate, opmode=0xc
5598334: engineUpdate, opmode=0xc
5598359: TXMODE, freq=903000000, len=23, SF=8, BW=500, CR=4/5, IH=0
5912661: RXMODE_SINGLE, freq=923300000, SF=7, BW=500, CR=4/5, IH=0
5975906: RXMODE_SINGLE, freq=923300000, SF=12, BW=500, CR=4/5, IH=0
5978478: EV_JOIN_FAILED
5983995: engineUpdate, opmode=0xc
6820817: engineUpdate, opmode=0xc
6820845: TXMODE, freq=906100000, len=23, SF=10, BW=125, CR=4/5, IH=0
7156714: RXMODE_SINGLE, freq=925100000, SF=10, BW=500, CR=4/5, IH=0
7219790: RXMODE_SINGLE, freq=923300000, SF=12, BW=500, CR=4/5, IH=0
7222364: engineUpdate, opmode=0xc
7277965: engineUpdate, opmode=0xc
7277990: TXMODE, freq=907800000, len=23, SF=8, BW=500, CR=4/5, IH=0
7592292: RXMODE_SINGLE, freq=925100000, SF=7, BW=500, CR=4/5, IH=0
7655536: RXMODE_SINGLE, freq=923300000, SF=12, BW=500, CR=4/5, IH=0
7658109: EV_JOIN_FAILED
7663645: engineUpdate, opmode=0xc
8514192: engineUpdate, opmode=0xc
8514219: TXMODE, freq=909300000, len=23, SF=10, BW=125, CR=4/5, IH=0
8850089: RXMODE_SINGLE, freq=925100000, SF=10, BW=500, CR=4/5, IH=0
8913165: RXMODE_SINGLE, freq=923300000, SF=12, BW=500, CR=4/5, IH=0
8915737: engineUpdate, opmode=0xc
8969401: engineUpdate, opmode=0xc
8969426: TXMODE, freq=907800000, len=23, SF=8, BW=500, CR=4/5, IH=0
9283728: RXMODE_SINGLE, freq=925100000, SF=7, BW=500, CR=4/5, IH=0
9346973: RXMODE_SINGLE, freq=923300000, SF=12, BW=500, CR=4/5, IH=0
9349545: EV_JOIN_FAILED
9355057: engineUpdate, opmode=0xc
10130487: engineUpdate, opmode=0xc
10130515: TXMODE, freq=905100000, len=23, SF=10, BW=125, CR=4/5, IH=0
10466383: RXMODE_SINGLE, freq=926900000, SF=10, BW=500, CR=4/5, IH=0
10529460: RXMODE_SINGLE, freq=923300000, SF=12, BW=500, CR=4/5, IH=0
10532032: engineUpdate, opmode=0xc
10584482: engineUpdate, opmode=0xc
10584507: TXMODE, freq=912600000, len=23, SF=8, BW=500, CR=4/5, IH=0
10898810: RXMODE_SINGLE, freq=926900000, SF=7, BW=500, CR=4/5, IH=0
10962054: RXMODE_SINGLE, freq=923300000, SF=12, BW=500, CR=4/5, IH=0
10964627: EV_JOIN_FAILED
https://www.thethingsnetwork.org/forum/t/rn2903-au-firmware/7127/7
It seems there is a new Version 2 of TTGO boards upcoming on AliExpress. I found the enclosed change log table for it.
Using the PICO-D4 is a good idea. Much less to go wrong since much of ancillaries are integrated into the chip 
Hi @88bit -
Be sure that you have APPEUI and DEV EUI in LSB format as imported from your device in TTN. Then be sure you have APPKEY as well, in MSB format.
I don’t see APPEUI in your code. Maybe a cut and paste thing.
I hope this helps.
The version 1 is what we are using. Version 2 is already available on alliexpres.
https://nl.aliexpress.com/item/1-Stks-TTGO-LORA32-V2-0-868-915-Mhz-ESP32-LoRa-OLED-0-96-Inch-Sd/32847471775.html
I will post Part 2 of this topic today with pictures of the different Heltec and TTGO boards (V2 included).
I am looking for answers to the following for the part 2 post:
I don’t have a TTGO board yet, so I cannot test it.
Meanwhile i checked the pin connection between SX1276 chip and ESP32 GPIOs on two “Heltec” Boards: No. 1 has coil antenna for wifi and ESP32 CPU Revision 1. No. 2 has no coil antenna for wifi (but the unconnected pcb antenna) and ESP32 CPU Revision 0.
It came out: both boards have same pin configuration, i checked this with a multimeter. pin mappings see below.
But LMiC does not run on board no. 2. As soon as a packet is to be transmitted, LMiC runs on error and crashes. I guess the SPI communication goes wrong, or there is some issue with the SX1276.
I dismounted the OLED display on both boars to check the RF chip version. Both boards have an RF chip labelled “SX1276”.
Pin mappings:
// Hardware pin definitions for Heltec LoRa-32 Board with Semtech SX1276 Chip
#define SS 18 // ESP32 GPIO18 (Pin18) – SX1276 NSS (Pin19) SPI Chip Select Input
#define MOSI 27 // ESP32 GPIO27 (Pin27) – SX1276 MOSI (Pin18) SPI Data Input
#define MISO 19 // ESP32 GPIO19 (Pin19) – SX1276 MISO (Pin17) SPI Data Output
#define SCK 5 // ESP32 GPIO5 (Pin5) – SX1276 SCK (Pin16) SPI Clock Input
#define RST 14 // ESP32 GPIO14 (Pin14) – SX1276 NRESET (Pin7) Reset Trigger Input
#define DIO0 26 // ESP32 GPIO26 (Pin15) – SX1276 DIO0 (Pin8) used by LMIC for detecting LoRa RX_Done & TX_Done
#define DIO1 33 // ESP32 GPIO33 (Pin13) – SX1276 DIO1 (Pin9) used by LMIC for detecting LoRa RX_Timeout
#define DIO2 32 // ESP32 GPIO32 (Pin12) – SX1276 DIO2 (Pin10) not used by LMIC for LoRa (Timeout for FSK only)// Hardware pin definitions for Heltec LoRa-32 Board with OLED SSD1306 I2C Display
#define OLED_RST 16 // ESP32 GPIO16 (Pin16) – SD1306 Reset
#define OLED_SDA 4 // ESP32 GPIO4 (Pin4) – SD1306 Data
#define OLED_SCL 15 // ESP32 GPIO15 (Pin15) – SD1306 Clock