ESP32 Networking Question

[A622266]

I have a gnuradio flowgraph running that has a UDP source (server) listening on 192.168.1.22:56000, and UDP sinks sending a sinewave on 192.168.1.22:55000 and 192.168.1.11:55000

The following code is intended to receive the sinewave on port 55000 at the PC or the esp32 and send it back to gnuradio on port 56000. The function esp_network just connects the esp32 to the network, which succeeds on 192.168.1.11. I can ping this address successfully when running on the esp32. The pc is on 192.1681.22.

The code works in CPython. However when run on the esp32, it does not work. The main issue seems to be on the side where gnuradio is sending to the esp32. I was able to change the code below to generate a signal in the esp32 and I succeeded to send it to gnuradio.

Does anyone have an idea of what I can try to debug the path from gnuradio to the esp32?

try:
        import usocket as socket
        import esp_network  
        esp_network.do_connect()
        uc_server_addr = ("192.168.1.11", 55000)
except:
        import socket as socket
        uc_server_addr = ("192.168.1.22", 55000)


pc_server_addr = ("192.168.1.22", 56000)      # This is IP of the server (gnuradio udp source)

# Socket to exchange data with GR
c = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

s.bind(uc_server_addr)

BUFFER = 8192

while True:
        samples, address = s.recvfrom(BUFFER)
        print(samples)
        c.sendto(samples, pc_server_addr)

[A622266]

I simplified the code to focus only on the gnuradio to eps32 link. I added a print statement to look at the object after the bind method is called:

try:
        import socket as socket
        import esp_network  
        esp_network.do_connect()
        uc_server_addr = ("192.168.1.11", 55000)
except:
        import socket as socket
        uc_server_addr = ("192.168.1.22", 55000)

# Socket to exchange data with GR
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

binding = s.bind(uc_server_addr)
print(f'binding = {binding}')

BUFFER = 4

samples, address = s.recvfrom(BUFFER)
print(f'number of bytes received = {len(samples)}')

In CPython, this returns the following:

binding = None
number of bytes received = 4

I did not expect the binding to have the value None, but anyway, the program ran and received the expected 4 bytes.

When running at the esp32:

network config: ('192.168.1.11', '255.255.255.0', '192.168.1.1', '192.168.1.1')
binding = None

Note that the esp32 successfully connects to my network at 192.168.1.1. binding also has the value None as in the CPython case. However, no data are received.

[A622266]

I wrote a client in python, and it is able to communicate with the esp32. So the issue must be in my gnuradio workflow. Since it doesn't appear to have anything to do with micropython, I'll mark the topic as answered.