Python

First of all, I'm not good at English. I'm trying to be politely..

I'm making a program that communicate some gateways using pymodbus(python 3.9, pymodbus 2.5.2).

Recently, when the program is working, I analyzed network via WireShark. and then I realize that each command(read_holding_registers, write_registers, ...) make a connection with server. like this,..

connect() 
read_holding_registers() 
close() 
connect() 
read_holding_registers() 
close() 
...,

Is it right?

I expect this,,

connect() 
read_holding_registers(..) 
read_holding_registers(..) 
read_holding_registers(..) ... 
close()

I think, first, making a connection, second, all commands are done, and finally destroy connection.

Of course, all commands are in a same function. but there is a delay time each command.

with ModbusClient('10.181.10.15', 502) as client:
    client.connect()
    for unit in range(80, 91):
        time.sleep(0.3)
        data = client.read_holding_registers(600, 40, unit=unit)
        print('600 unit id = %d' % unit)
        time.sleep(0.3)
        data = client.read_holding_registers(700, 30, unit=unit)
        print('700 unit id = %d' % unit)

    client.close()

player1 = turtle.Turtle()
player1.speed(0)
player1.shape("circle")
player1.shapesize(stretch_len=3, stretch_wid=3)
player1.color("white")
player1.penup()
player1.goto(x=-350, y=0)

payload = json.loads(message.payload.decode())

deviceNAME = payload["deviceName"]
deviceEUI = payload["devEUI"]
info = payload["rxInfo"]
print (len(payload))
print (len(info))
print (payload)
print(info)

10
1
{'applicationID': '13', 'applicationName': '16_CH_CM_SYSTEM', 'deviceName': '16_CH_CM_SYSTEM_LORA', 'devEUI': 'ff00058011000004', 'rxInfo': [{'gatewayID': '54d0b4fffe0c89b2', 'name': 'F8L10GW-915-L-SR5G', 'time': '2022-11-25T05:39:41.352315Z', 'rssi': -107, 'loRaSNR': 6.3, 'location': {'latitude': na, 'longitude': na, 'altitude': na}}], 'txInfo': {'frequency': 923400000, 'dr': 4}, 'adr': False, 'fCnt': 5527, 'fPort': 21, 'data': 'VDI1NTI1NjI1OTI1ODI1OTI1NzI1NjI2MDI2Mjo='}
[{'gatewayID': '54d0b4fffe0c89b2', 'name': 'F8L10GW-915-L-SR5G', 'time': '2022-11-25T05:39:41.352315Z', 'rssi': -107, 'loRaSNR': 6.3, 'location': {'latitude': na, 'longitude': na, 'altitude': na}}]