Socket having to close and reopen

[soren]

Hello,

I have a Raspberry pie connected to 4 Lopy's over wifi, and a java tcp server program running on the rpi with sockets (with different port) for each lopy.

My problem is that I have to close the connection after sending a bytearray, and the repon it again when I need to send the next bytearray. The time it takes for it to reconnect to the socket is not really feasible for the system.
Is it supposed to work like this with sockets, or am I doing something wrong?

The server code is here: https://github.com/ITU-PerCom-2017/10.-Coop-Predictive-Equipment-Maintenance/blob/master/java/src/TCPServer.java

And the lopy code is here:

from network import Bluetooth
from network import WLAN
import socket
#from network import socket
import pycom
import time
import machine
import binascii
from machine import Timer
pycom.heartbeat(False)
pycom.rgbled(0x000000) # turn off led

lopyID = 4 # set this unique to each lopy
print('started! lopy id: ', lopyID)
#for breaking out of while(True) loops. Removed when program is finished
chrono = Timer.Chrono() #
chrono.start()

wlan = WLAN(mode=WLAN.STA)
nets = wlan.scan()



pycom.rgbled(0x7f0770)
time.sleep(0.5)
pycom.rgbled(0x000000) # turn off led
time.sleep(1)
pycom.rgbled(0x7f0770)
time.sleep(0.5)
pycom.rgbled(0x000000) # turn off led
time.sleep(1)
pycom.rgbled(0x7f0770)
time.sleep(0.5)
pycom.rgbled(0x000000) # turn off led
time.sleep(1)
pycom.rgbled(0x7f0770)
time.sleep(0.5)
pycom.rgbled(0x000000) # turn off led
time.sleep(1)
pycom.rgbled(0x7f0000) # red
#time.sleep(0.5)
#pycom.rgbled(0x000000) # turn off led
#time.sleep(1)

pycom.rgbled(0x7f0000)
for net in nets: # connect to rpi wifi
     if net.ssid == 'cooppifi':
         print('rpi found!')
         wlan.connect(net.ssid, auth=(net.sec, 'cooppifi2017'), timeout=4000)
         for _ in range(20):
             time.sleep(1)
             if wlan.isconnected():
                 print("connected to rpi")
                 break
             print('.', end='')
         else:
             print("could not connect to wifi, resetting lopy...")
             machine.reset()

bluetooth = Bluetooth()
bluetooth.start_scan(-1)
adv = None # bluetooth advertisementa


time.sleep(2)

def sendToSocket(beaconID, rssi):
    RSSIpositive = rssi * -1
    #newData = beaconID + lopyID + RSSIpositive
    #newData = 255
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.connect(socket.getaddrinfo('10.42.0.1', 6792)[0][-1])
    pycom.rgbled(0x007f00)
    time.sleep(0.5)
    pycom.rgbled(0x000000) # turn off led
    time.sleep(0.5)
    print('.')
    data = bytearray()
    #data.append(newData)
    data.append(lopyID)
    data.append(beaconID)
    data.append(RSSIpositive)
    print("sending to socket, binary: ", data, data[0])
    #conv = binascii.hexlify(data)
    #print(conv, encoding='utf8')
    s.send(data)
    s.close()

# b'f3bc0b6feb4c' # raw: b'\xf3\xbc\x0bo\xebL'
# b'edbed48d0b87' # raw: b'\xed\xbe\xd4\x8d\x0b\x87
# b'c7c383eeaaa4' # raw?
# b'cd87e6a38dc2' # raw?

pycom.rgbled(0x007f00) # green
while True:

    adv = bluetooth.get_adv()

    if adv != None:
        #print('!')
        #print('!!')
        macRaw = adv[0] # binary mac address

        macReal = binascii.hexlify(macRaw) # convert to hexadecimal
        if macReal == b'f3bc0b6feb4c':
            print('beacon A rssi: ', adv[3]) # adv[3] is rssi
            sendToSocket(beaconID = 1, rssi = adv[3])
        elif macReal == b'edbed48d0b87':
            print('beacon B rssi: ', adv[3])
            sendToSocket(beaconID = 2, rssi = adv[3])
        elif macReal == b'c7c383eeaaa4':
            print('beacon C rssi: ', adv[3])
            sendToSocket(beaconID = 3, rssi = adv[3])
        elif macReal == b'cd87e6a38dc2':
            print('beacon D rssi: ', adv[3])
            sendToSocket(beaconID = 4, rssi = adv[3]) # adv[3]
    #time.sleep(1)

    #lap = chrono.read() # for breaking out of loop (remove this part when program is finished)
    #if lap > 30:
    #    print("breaking")
    #    bluetooth.stop_scan()
    #    break
```

[livius]

@soren said in Socket having to close and reopen:
You close socket on server side then you must close it also on client side(it is closed already but..)
Question is what problem do you have with the code?
Is it working, if yes, do you ask if there is some better way?