Connect Mac/iPhone to a Simple Python Socket Server (Raspberry Pi Part)

This example shows a simple python socket server on a Raspberry Pi. A custom port is used instead of the HTTP port 80.

The server is tested at a remote Mac computer with:
1) telnet command
2) client python code
3) iOS app on simulator

Setup a socket server

1. Edit the server.py file on Raspberry Pi with this command:

sudo nano server.py

2. Edit and save the file as:

import socket

mysocket = socket.socket()

host = socket.gethostbyname(socket.getfqdn())

port = 9876

if host == "127.0.1.1":

    import commands

    host = commands.getoutput("hostname -I")

print "host = " + host

#Prevent socket.error: [Errno 98] Address already in use

mysocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

mysocket.bind((host, port))

mysocket.listen(5)

c, addr = mysocket.accept()

while True:

    data = c.recv(1024)

    data = data.replace("\r\n", '') #remove new line character

    inputStr = "Received " + data + " from " + addr[0]

    print inputStr

    c.send("Hello from Raspberry Pi!\nYou sent: " + data + "\nfrom: " + addr[0] + "\n")

    if data == "Quit": break

c.send("Server stopped\n")

print "Server stopped"

c.close()

3. Enable the server with this command:

python server.py

Results on a remote Mac computer


1) telnet command

1. Type this command to connect to Raspberry Pi:

telnet 192.168.xx.xx 9876

2. Type these strings:

this is mac
have a nice day
abcdefg
Quit

2) client python code


1. Edit a simple client.py file on Mac as:

import socket

server = socket.socket()

host = "192.168.xx.xx"

port = 9876

server.connect((host, port))

server.sendall("This is client")

print(server.recv(1024)) #Normal server response

server.sendall("Quit")

print(server.recv(1024)) #Quit server response

server.close()

2. Execute the client.py file on Mac terminal:

python client.py

3) iOS app on simulator

Create an iOS app with Swift. See this:
Connect Mac / iPhone to a Simple Python Socket Server (iOS Part)

And the result is:

References:
Connect iOS device to HTTP GET/POST PHP service (Raspberry Pi Part) (iOS Part)
Connect iOS device to MySQL database on a server (Raspberry Pi Part) (iOS Part)
Connect Mac/iPhone to a Simple Python Socket Server (iOS Part)
Sending an RSA encrypted message from client to Python socket server

Go back to Communication between iOS device (Client) and Raspberry Pi (Server)