How to send data between two Raspberry Pis in two separate houses using TCP

So I'm trying to figure out how to send string data between two Pi Zero W units. I want one of them to be with me and one of them to be with one of my friends in her house. I'm really confused as to how this would work. I found a bit of code that seemed to work for both units in my house but, after changing the IP Address to my friend's public IP and trying to use it at her house, nothing came through. I'm fairly new to using internet protocols so any help would be appreciated.

Send.py

import sys

from socket import socket, AF_INET, SOCK_DGRAM



SERVER_IP   = ''

PORT_NUMBER = 5000

SIZE = 1024

print ("Test client sending packets to IP {0}, via port 

{1}n".format(SERVER_IP, 

PORT_NUMBER))



mySocket = socket( AF_INET, SOCK_DGRAM )



while True:

    myMessage = input()

    mySocket.sendto(myMessage.encode('utf-8'),(SERVER_IP,PORT_NUMBER))

sys.exit()

Receive.py

#!/usr/bin/env python3



from socket import socket, gethostbyname, AF_INET, SOCK_DGRAM

import sys

PORT_NUMBER = 5000

SIZE = 128



hostName = gethostbyname( '0.0.0.0' )



mySocket = socket( AF_INET, SOCK_DGRAM )

mySocket.bind( (hostName, PORT_NUMBER) )



print ("Test server listening on port {0}n".format(PORT_NUMBER))



while True:

    (data,addr) = mySocket.recvfrom(SIZE)

    print(data.decode('utf-8'))

sys.exit()

edited Nov 28 '18 at 1:41

Pang

6,9531664103

asked Nov 27 '18 at 23:13

Charlie C

132

Did you do any port forwarding on your/your friend's router?

– FamousJameous
Nov 27 '18 at 23:18

You should probably learn TCP inside out before you try messing with UDP. It's much more complicated.

– David Schwartz
Nov 27 '18 at 23:22

@FamousJameous I did set up port forwarding on mine but not hers.

– Charlie C
Nov 27 '18 at 23:26

Your question asks about TCP but your code requests UDP sockets.

– David Schwartz
Nov 27 '18 at 23:29

@DavidSchwartz Like I said Im new to this stuff and I really dont know where I can go to research it

– Charlie C
Nov 27 '18 at 23:30

|
show 1 more comment

Send.py

import sys

from socket import socket, AF_INET, SOCK_DGRAM



SERVER_IP   = ''

PORT_NUMBER = 5000

SIZE = 1024

print ("Test client sending packets to IP {0}, via port 

{1}n".format(SERVER_IP, 

PORT_NUMBER))



mySocket = socket( AF_INET, SOCK_DGRAM )



while True:

    myMessage = input()

    mySocket.sendto(myMessage.encode('utf-8'),(SERVER_IP,PORT_NUMBER))

sys.exit()

Receive.py

#!/usr/bin/env python3



from socket import socket, gethostbyname, AF_INET, SOCK_DGRAM

import sys

PORT_NUMBER = 5000

SIZE = 128



hostName = gethostbyname( '0.0.0.0' )



mySocket = socket( AF_INET, SOCK_DGRAM )

mySocket.bind( (hostName, PORT_NUMBER) )



print ("Test server listening on port {0}n".format(PORT_NUMBER))



while True:

    (data,addr) = mySocket.recvfrom(SIZE)

    print(data.decode('utf-8'))

sys.exit()

edited Nov 28 '18 at 1:41

Pang

6,9531664103

asked Nov 27 '18 at 23:13

Charlie C

132

Did you do any port forwarding on your/your friend's router?

– FamousJameous
Nov 27 '18 at 23:18

You should probably learn TCP inside out before you try messing with UDP. It's much more complicated.

– David Schwartz
Nov 27 '18 at 23:22

@FamousJameous I did set up port forwarding on mine but not hers.

– Charlie C
Nov 27 '18 at 23:26

Your question asks about TCP but your code requests UDP sockets.

– David Schwartz
Nov 27 '18 at 23:29

@DavidSchwartz Like I said Im new to this stuff and I really dont know where I can go to research it

– Charlie C
Nov 27 '18 at 23:30

|
show 1 more comment

Send.py

import sys

from socket import socket, AF_INET, SOCK_DGRAM



SERVER_IP   = ''

PORT_NUMBER = 5000

SIZE = 1024

print ("Test client sending packets to IP {0}, via port 

{1}n".format(SERVER_IP, 

PORT_NUMBER))



mySocket = socket( AF_INET, SOCK_DGRAM )



while True:

    myMessage = input()

    mySocket.sendto(myMessage.encode('utf-8'),(SERVER_IP,PORT_NUMBER))

sys.exit()

Receive.py

#!/usr/bin/env python3



from socket import socket, gethostbyname, AF_INET, SOCK_DGRAM

import sys

PORT_NUMBER = 5000

SIZE = 128



hostName = gethostbyname( '0.0.0.0' )



mySocket = socket( AF_INET, SOCK_DGRAM )

mySocket.bind( (hostName, PORT_NUMBER) )



print ("Test server listening on port {0}n".format(PORT_NUMBER))



while True:

    (data,addr) = mySocket.recvfrom(SIZE)

    print(data.decode('utf-8'))

sys.exit()

edited Nov 28 '18 at 1:41

Pang

6,9531664103

asked Nov 27 '18 at 23:13

Charlie C

132

Send.py

import sys

from socket import socket, AF_INET, SOCK_DGRAM



SERVER_IP   = ''

PORT_NUMBER = 5000

SIZE = 1024

print ("Test client sending packets to IP {0}, via port 

{1}n".format(SERVER_IP, 

PORT_NUMBER))



mySocket = socket( AF_INET, SOCK_DGRAM )



while True:

    myMessage = input()

    mySocket.sendto(myMessage.encode('utf-8'),(SERVER_IP,PORT_NUMBER))

sys.exit()

Receive.py

#!/usr/bin/env python3



from socket import socket, gethostbyname, AF_INET, SOCK_DGRAM

import sys

PORT_NUMBER = 5000

SIZE = 128



hostName = gethostbyname( '0.0.0.0' )



mySocket = socket( AF_INET, SOCK_DGRAM )

mySocket.bind( (hostName, PORT_NUMBER) )



print ("Test server listening on port {0}n".format(PORT_NUMBER))



while True:

    (data,addr) = mySocket.recvfrom(SIZE)

    print(data.decode('utf-8'))

sys.exit()

python tcp wireless data-transfer

edited Nov 28 '18 at 1:41

Pang

6,9531664103

asked Nov 27 '18 at 23:13

Charlie C

132

edited Nov 28 '18 at 1:41

Pang

6,9531664103

asked Nov 27 '18 at 23:13

Charlie C

132

edited Nov 28 '18 at 1:41

Pang

6,9531664103

edited Nov 28 '18 at 1:41

Pang

6,9531664103

edited Nov 28 '18 at 1:41

Pang

6,9531664103

asked Nov 27 '18 at 23:13

Charlie C

132

asked Nov 27 '18 at 23:13

Charlie C

132

asked Nov 27 '18 at 23:13

Charlie C

132

Did you do any port forwarding on your/your friend's router?

– FamousJameous
Nov 27 '18 at 23:18

You should probably learn TCP inside out before you try messing with UDP. It's much more complicated.

– David Schwartz
Nov 27 '18 at 23:22

@FamousJameous I did set up port forwarding on mine but not hers.

– Charlie C
Nov 27 '18 at 23:26

Your question asks about TCP but your code requests UDP sockets.

– David Schwartz
Nov 27 '18 at 23:29

@DavidSchwartz Like I said Im new to this stuff and I really dont know where I can go to research it

– Charlie C
Nov 27 '18 at 23:30

|
show 1 more comment

Did you do any port forwarding on your/your friend's router?

– FamousJameous
Nov 27 '18 at 23:18

You should probably learn TCP inside out before you try messing with UDP. It's much more complicated.

– David Schwartz
Nov 27 '18 at 23:22

@FamousJameous I did set up port forwarding on mine but not hers.

– Charlie C
Nov 27 '18 at 23:26

Your question asks about TCP but your code requests UDP sockets.

– David Schwartz
Nov 27 '18 at 23:29

@DavidSchwartz Like I said Im new to this stuff and I really dont know where I can go to research it

– Charlie C
Nov 27 '18 at 23:30

Did you do any port forwarding on your/your friend's router?

– FamousJameous
Nov 27 '18 at 23:18

You should probably learn TCP inside out before you try messing with UDP. It's much more complicated.

– David Schwartz
Nov 27 '18 at 23:22

@FamousJameous I did set up port forwarding on mine but not hers.

– Charlie C
Nov 27 '18 at 23:26

Your question asks about TCP but your code requests UDP sockets.

– David Schwartz
Nov 27 '18 at 23:29

@DavidSchwartz Like I said Im new to this stuff and I really dont know where I can go to research it

– Charlie C
Nov 27 '18 at 23:30

|
show 1 more comment

1 Answer
1

active

oldest

votes

if you want to connect them together:

RPI that listens to incoming TCP connections (Receive.py) has to have firewall port open on RPI (https://raspberrypi.stackexchange.com/questions/69123/how-to-open-a-port)

there has to be port open on your home router that connects your RPI to the ISP

your RPI cannot be behind provider's NAT network - sometimes, you can purchase a static IP address from your provider, that doesn't change or at least public IP address that dynamically changes in time.

You can check if you're behind NAT in router admin page, check if the IP that router got assigned from ISP is the same as your IP address that servers on the internet see. Do this query:

https://www.google.com/search?q=what+is+my+ip+address )

If they're same, you're not behind ISP's NAT and problem is not probably there. If the're different, you share IP's with other ISP's customers and you cannot run your own server app that will expose it's port to the internet.

edited Nov 28 '18 at 1:56

answered Nov 28 '18 at 1:50

nio

4,37821632

Thank you! So I am not under my ISP's NAT. I can see my public IP and it is the same as my routers. But my friends IP is under her ISP's NAT. So I'm guessing this way wont work. Is their anyway that I can send data between us that doesn't require us both to not be under our ISP's NATs? Or what are some ways that I could set this up?

– Charlie C
Nov 28 '18 at 4:41

You can run socket server that listens at your home and the friend's RPI will connect to yours, because you can initiate TCP stream from inside of NAT network with no problem.

– nio
Nov 28 '18 at 12:21

Ok thanks. Ill look into that. Again like I said, Im very new to this so thank you

– Charlie C
Nov 28 '18 at 14:54

add a comment |

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1 Answer
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active

oldest

votes

1 Answer
1

active

oldest

votes

if you want to connect them together:

RPI that listens to incoming TCP connections (Receive.py) has to have firewall port open on RPI (https://raspberrypi.stackexchange.com/questions/69123/how-to-open-a-port)

there has to be port open on your home router that connects your RPI to the ISP

your RPI cannot be behind provider's NAT network - sometimes, you can purchase a static IP address from your provider, that doesn't change or at least public IP address that dynamically changes in time.

You can check if you're behind NAT in router admin page, check if the IP that router got assigned from ISP is the same as your IP address that servers on the internet see. Do this query:

https://www.google.com/search?q=what+is+my+ip+address )

edited Nov 28 '18 at 1:56

answered Nov 28 '18 at 1:50

nio

4,37821632

Thank you! So I am not under my ISP's NAT. I can see my public IP and it is the same as my routers. But my friends IP is under her ISP's NAT. So I'm guessing this way wont work. Is their anyway that I can send data between us that doesn't require us both to not be under our ISP's NATs? Or what are some ways that I could set this up?

– Charlie C
Nov 28 '18 at 4:41

You can run socket server that listens at your home and the friend's RPI will connect to yours, because you can initiate TCP stream from inside of NAT network with no problem.

– nio
Nov 28 '18 at 12:21

Ok thanks. Ill look into that. Again like I said, Im very new to this so thank you

– Charlie C
Nov 28 '18 at 14:54

add a comment |

if you want to connect them together:

RPI that listens to incoming TCP connections (Receive.py) has to have firewall port open on RPI (https://raspberrypi.stackexchange.com/questions/69123/how-to-open-a-port)

there has to be port open on your home router that connects your RPI to the ISP

your RPI cannot be behind provider's NAT network - sometimes, you can purchase a static IP address from your provider, that doesn't change or at least public IP address that dynamically changes in time.

You can check if you're behind NAT in router admin page, check if the IP that router got assigned from ISP is the same as your IP address that servers on the internet see. Do this query:

https://www.google.com/search?q=what+is+my+ip+address )

edited Nov 28 '18 at 1:56

answered Nov 28 '18 at 1:50

nio

4,37821632

Thank you! So I am not under my ISP's NAT. I can see my public IP and it is the same as my routers. But my friends IP is under her ISP's NAT. So I'm guessing this way wont work. Is their anyway that I can send data between us that doesn't require us both to not be under our ISP's NATs? Or what are some ways that I could set this up?

– Charlie C
Nov 28 '18 at 4:41

You can run socket server that listens at your home and the friend's RPI will connect to yours, because you can initiate TCP stream from inside of NAT network with no problem.

– nio
Nov 28 '18 at 12:21

Ok thanks. Ill look into that. Again like I said, Im very new to this so thank you

– Charlie C
Nov 28 '18 at 14:54

add a comment |

if you want to connect them together:

RPI that listens to incoming TCP connections (Receive.py) has to have firewall port open on RPI (https://raspberrypi.stackexchange.com/questions/69123/how-to-open-a-port)

there has to be port open on your home router that connects your RPI to the ISP

your RPI cannot be behind provider's NAT network - sometimes, you can purchase a static IP address from your provider, that doesn't change or at least public IP address that dynamically changes in time.

You can check if you're behind NAT in router admin page, check if the IP that router got assigned from ISP is the same as your IP address that servers on the internet see. Do this query:

https://www.google.com/search?q=what+is+my+ip+address )

edited Nov 28 '18 at 1:56

answered Nov 28 '18 at 1:50

nio

4,37821632

if you want to connect them together:

RPI that listens to incoming TCP connections (Receive.py) has to have firewall port open on RPI (https://raspberrypi.stackexchange.com/questions/69123/how-to-open-a-port)

there has to be port open on your home router that connects your RPI to the ISP

your RPI cannot be behind provider's NAT network - sometimes, you can purchase a static IP address from your provider, that doesn't change or at least public IP address that dynamically changes in time.

You can check if you're behind NAT in router admin page, check if the IP that router got assigned from ISP is the same as your IP address that servers on the internet see. Do this query:

https://www.google.com/search?q=what+is+my+ip+address )

edited Nov 28 '18 at 1:56

answered Nov 28 '18 at 1:50

nio

4,37821632

edited Nov 28 '18 at 1:56

answered Nov 28 '18 at 1:50

nio

4,37821632

answered Nov 28 '18 at 1:50

nio

4,37821632

answered Nov 28 '18 at 1:50

nio

4,37821632

Thank you! So I am not under my ISP's NAT. I can see my public IP and it is the same as my routers. But my friends IP is under her ISP's NAT. So I'm guessing this way wont work. Is their anyway that I can send data between us that doesn't require us both to not be under our ISP's NATs? Or what are some ways that I could set this up?

– Charlie C
Nov 28 '18 at 4:41

You can run socket server that listens at your home and the friend's RPI will connect to yours, because you can initiate TCP stream from inside of NAT network with no problem.

– nio
Nov 28 '18 at 12:21

Ok thanks. Ill look into that. Again like I said, Im very new to this so thank you

– Charlie C
Nov 28 '18 at 14:54

add a comment |

Thank you! So I am not under my ISP's NAT. I can see my public IP and it is the same as my routers. But my friends IP is under her ISP's NAT. So I'm guessing this way wont work. Is their anyway that I can send data between us that doesn't require us both to not be under our ISP's NATs? Or what are some ways that I could set this up?

– Charlie C
Nov 28 '18 at 4:41

You can run socket server that listens at your home and the friend's RPI will connect to yours, because you can initiate TCP stream from inside of NAT network with no problem.

– nio
Nov 28 '18 at 12:21

Ok thanks. Ill look into that. Again like I said, Im very new to this so thank you

– Charlie C
Nov 28 '18 at 14:54

Thank you! So I am not under my ISP's NAT. I can see my public IP and it is the same as my routers. But my friends IP is under her ISP's NAT. So I'm guessing this way wont work. Is their anyway that I can send data between us that doesn't require us both to not be under our ISP's NATs? Or what are some ways that I could set this up?

– Charlie C
Nov 28 '18 at 4:41

You can run socket server that listens at your home and the friend's RPI will connect to yours, because you can initiate TCP stream from inside of NAT network with no problem.

– nio
Nov 28 '18 at 12:21

Ok thanks. Ill look into that. Again like I said, Im very new to this so thank you

– Charlie C
Nov 28 '18 at 14:54

add a comment |

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