# mini-beieli-node - Bienenstock Ueberwachung

Code fuer den LoraWAN Node

Autor: Joerg Lehmann, nbit Informatik GmbH

| Parameter         | Value                       |
| ----------------- | --------------------------- |
| Board             | MCCI Catena 4610            |
| LoraWAN Subband   | "Default, works everywhere" |
| Serial interface  | Generic Serial              | 
| LoraWAN Network   | Swisscom                    |
| System Clock      | 24 MHz                      |
| LoraWAN Region    | Europe 868 MHz              |
| Optimize          | Smallest (-Os default)      |

Das sind die verwendeten Libraries [1]:

| URL | Commit | Commit Date |
| --- | -----  | ----------- |
| https://github.com/mcci-catena/Adafruit_BME280_Library.git  | 3dafbe1 | Wed, 13 Dec 2017 13:56:30 -0500  |
| https://github.com/mcci-catena/Adafruit_Sensor.git  | f2af6f4 | Tue, 1 Sep 2015 15:57:59 +0200  |
| https://github.com/mcci-catena/arduino-lmic.git  | 1964dcf | Mon, 22 Jun 2020 10:54:56 -0400  |
| https://github.com/mcci-catena/arduino-lorawan.git  | 4bc0d48 | Sat, 9 May 2020 12:38:28 -0400  |
| https://github.com/mcci-catena/Catena-Arduino-Platform.git  | 478ad23 | Fri, 26 Jun 2020 18:39:01 -0400  |
| https://github.com/mcci-catena/Catena-mcciadk.git  | a428006 | Sat, 21 Dec 2019 20:45:26 -0500  |
| https://github.com/mcci-catena/MCCI_FRAM_I2C.git  | f0a5ea5 | Sat, 21 Dec 2019 16:17:01 -0500  |
| https://github.com/tatobari/Q2-HX711-Arduino-Library.git  | ccda8d8 | Wed, 13 Mar 2019 12:41:44 -0300  |
| https://github.com/sparkfun/SparkFun_Qwiic_Scale_NAU7802_Arduino_Library.git  | 688f255 | Fri, 3 Jan 2020 12:35:22 -0700  |
| https://github.com/mcci-catena/OneWire.git  | d814a7b | Thu, 26 Apr 2018 03:45:27 +0800  |
| https://github.com/mcci-catena/SHT1x.git  | be7042c | Tue, 20 Sep 2011 13:56:23 +1000  |


Patch arduino-lmic, so initial SF12 is used initially:

`
[joerg@cinnamon src]$ git diff
diff --git a/src/lmic/lmic_bandplan_eu868.h b/src/lmic/lmic_bandplan_eu868.h
index efff7d5..74efb37 100644
--- a/src/lmic/lmic_bandplan_eu868.h
+++ b/src/lmic/lmic_bandplan_eu868.h
@@ -61,7 +61,7 @@ LMICeu868_isValidBeacon1(const uint8_t *d) {
 #undef LMICbandplan_isFSK
 #define LMICbandplan_isFSK()    (/* RX datarate */LMIC.dndr == EU868_DR_FSK)
 
-#define LMICbandplan_getInitialDrJoin() (EU868_DR_SF7)
+#define LMICbandplan_getInitialDrJoin() (EU868_DR_SF12)
 
 void LMICeu868_setBcnRxParams(void);
 #define LMICbandplan_setBcnRxParams()   LMICeu868_setBcnRxParams()
`

`[1]:
[joerg@cinnamon libraries]$ for i in Adafruit_BME280_Library Adafruit_Sensor arduino-lmic arduino-lorawan Catena-Arduino-Platform Catena-mcciadk MCCI_FRAM_I2C Q2-HX711-Arduino-Library SparkFun_Qwiic_Scale_NAU7802_Arduino_Library OneWire SHT1x ; do cd $i; echo "| $(git remote -v |grep fetch |awk '{print $2}' |tr '\n' ' ') | $(git log --pretty=format:'%h | %cD ' -n 1) |" ; cd ..; done`


## Some Facts about RSSI and SNR

https://lora.readthedocs.io/en/latest/#rssi

RSSI minimum = -120 dBm.

RSSI < -90 dBm: this signal is extremely weak, at the edge of what a receiver can receive.
RSSI -67dBm: this is a fairly strong signal.
RSSI > -55dBm: this is a very strong signal.
RSSI > -30dBm: your sniffer is sitting right next to the transmitter.

https://lora.readthedocs.io/en/latest/#snr

Typical LoRa SNR values are between: -20dB and +10dB

A value closer to +10dB means the received signal is less corrupted.

LoRa can demodulate signals which are -7.5 dB to -20 dB below the noise floor.