Raspberry Pi3 Gateway

[rajeev2301]

@mfalkvidd Thanks a lot ! I followed the exact process at https://www.mysensors.org/build/raspberry.It looks like I have the required environment setup correctly. But when I run the below code , I still don't receive the correct message comming from Arduino ( I am using NRFL01 transceivers) .. Please suggest what am I missing..

mport RPi.GPIO as GPIO
from lib_nrf24 import NRF24
import time
import spidev

GPIO.setmode(GPIO.BCM)

pipes = [[0xE8, 0xE8, 0xF0, 0xF0, 0xE1], [0xF0, 0xF0, 0xF0, 0xF0, 0xE1]]
radio = NRF24(GPIO, spidev.SpiDev())

radio.begin(0,8)

radio.setPayloadSize(32)
radio.setChannel(0x76)
radio.setDataRate(NRF24.BR_1MBPS)
radio.setPALevel (NRF24.PA_MAX)
radio.setAutoAck(True)
radio.enableDynamicPayloads()
radio.enableAckPayload()
radio.openReadingPipe(1 ,pipes[1])
radio.printDetails()
radio.startListening()
radio.GPIO.cleanup()

while True:

while not radio.available(0):
   time.sleep(1/100)
   
Temp = []
radio.read(Temp, radio.getDynamicPayloadSize())
print("Received Temp: {}".format(Temp))
print("Translating our received Message into Unicode character...")

string1 = ""
for n in Temp:
          if (n >=32 and n <= 126):
             string1 += chr(n)
print (" Our received message decodes to : {} ".format(string1))

===============output =========
STATUS = 0x01 RX_DR=0 TX_DS=0 MAX_RT=0 RX_P_NO=0 TX_FULL=1
RX_ADDR_P0-1 � =
0x001effffff 0xffffffffff
RX_ADDR_P2-5 � =
0xff
0xfe
0xfe
0xfe

TX_ADDR =
0xffffffffff
RX_PW_P0-6 � =
0x00
0x00
0x00
0x00
0x00
0x00

EN_AA =
0x03

EN_RXADDR � =
0x00

RF_CH =
0x07

RF_SETUP � =
0x00

CONFIG =
0x00

DYNPD/FEATURE � =
0x00
0x00

Data Rate = 1MBPS
Model = nRF24L01
CRC Length = Disabled
PA Power = PA_MIN
Received: [4]
Translating the receivedMessage into unicode characters
Out received message decodes to:
Received: [5]
Translating the receivedMessage into unicode characters
Out received message decodes to:
Received: []
Translating the receivedMessage into unicode characters
Out received message decodes to:
Received: []
Translating the receivedMessage into unicode characters
Out received message decodes to:
Received: []
Translating the receivedMessage into unicode characters
Out received message decodes to:
Received: []

[mfalkvidd]

@rajeev2301 that looks like python code. To my knowledge, MySensors does not have any pyhon code. I'm completely lost. Sorry.

[rajeev2301]

@mfalkvidd

1. What is your recommendation for doing general programming on raspeberry Pi?
2. if not python , what code/programming language do you recommend to setup a serial gateway on raspberry pi so that I can receive messages from multiple arduino,s.

[mfalkvidd]

@rajeev2301 I would suggest no programming at all. Just create a raspberry pi gateway and connect a controller to it.

If you want to program yourself, use the serial api and connect to the gateway using a tcp, mqtt or serial port connection.

[rajeev2301]

@mfalkvidd

Thanks , I really appreciate your time for helping me out on this. I have recently started diggging into IOT world so I may be asking a trivial question. ( my apology and Thanks in advance

I have a following scenario:

I am trying to pull the temperature and humidity data from Arduino Nano and then transmitting it through NRF24L01 transreceivers. It works perfectly fine between arduino to Arduino Communication. However I am stuck when I am trying to receive the same information into my Raspeberry Pi3.
I believe , I have successfully setup a gateway by following step by step instruction (https://www.mysensors.org/build/raspberry) but now I want to receive the message relaying through my Arduino Nano for which I need to write a code in Raspberry Pi. That’s the reason I am writing a simple python code to receive that message. Please suggest if there are alternate way to receive the message from my arduino’s.

Thanks again for your kind guidance.

[mfalkvidd]

@rajeev2301 thanks for explaining your use case.

You can compile the MySensors raspbery pi gateway as an ethernet gateway, and let your python program connect to the raspberry pi gateway using tcp. The python program would not be concerned with nrf at all. MySensors will present sensor information the same way regardless which transport (nrf, rfm or rs485) used by the sensors.

The information presented by the gateway will follow the specification of the serial protocol that I linked earlier.

[rajeev2301]

@mfalkvidd

Thanks , really appreciate your quick response. Yes , I am aware of TCP but isn’t that it needs an Internet for communication.My plan is to exchange data between sensors wirelessly using radio frequency ( e.g, NRF24L01) so that I don’t have dependency on TCP/Internet. Also, my plan is to create a master-slave kind of setup. Where all sensor’s data really into central raspberry pi environment and then I can play around with dataset from multiple sources.
Your guidance would be highly appreciated.

[gohan]

If I were you I'd start looking at controllers like Domoticz, MyController, Home Assistant, Node-red etc etc, as there is already documentation on how to connect to a MySensors gateway and the rest

[mfalkvidd]

@rajeev2301 it sounds like you want to do pretty much what MySensor does, but you want to program every detail yourself? If that's the case, MySensors might not be the right forum/library. Most people use MySensors because they don't want to program all the details themselves. We just want a communication network, and that's what MySensors provides.

[rajeev2301]

@mfalkvidd

Thanks for your valuable input. I think I got some direction to move on.