disabled buffering in python

Buffering makes the systemd journal not show the logs at the right time.
And changed the systemd service file so that the new batman and bridge
interfaces are deleted when naxalnet.service is stopped. Also simplified
the Stopping section in the README because of this change.

Makefile

@@ -19,4 +19,4 @@ uninstall:
 
 
 clean:
-	rm -rf build naxalnet.egg-info
+	rm -rf build naxalnet.egg-info **/__pycache__

README.md

@@ -51,6 +51,7 @@ with anyone currently at risk of death in overcrowded prisons.
 - two or more computers, or laptops with WiFi adapter, called nodes
 - systemd-resolved (optional, for DNS)
 - batctl (optional, for debugging)
+- python pip (optional, for uninstalling)
 
 ## Installing
 
@@ -112,6 +113,7 @@ To start naxalnet, do the command on all the nodes:
 sudo systemctl start naxalnet.service
 ```
 
+This will start a mesh network and connect to all nodes.
 To test if it works, run `sudo batctl n -w` and check for
 nodes. If there are any nodes, your network is up.
 
@@ -152,10 +154,7 @@ sudo systemctl disable naxalnet.service
 ### Stopping the service
 
 ```sh
-# Stop the services
 sudo systemctl stop naxalnet systemd-networkd systemd-resolved iwd
-# Delete the virtual interfaces created by naxalnet
-sudo networkctl delete bat0 bridge0
 ```
 
 If your distribution uses NetworkManager, starting `naxalnet.service`

naxalnet.service

@@ -1,16 +1,11 @@
-# naxalnet systemd service
+# The naxalnet systemd service
 # See man:systemd.service(5) and man:systemd.unit(5)
 # before editing this file.
 [Unit]
-Description=Naxalnet
+Description=Setup mesh networks
 Requires=systemd-networkd.service
 Requires=iwd.service
 Wants=systemd-resolved.service
-# naxalnet does not reload networkd, so networkd
-# should be started only afer naxalnet exits.
-# This should be changed when naxalnet becomes
-# a daemon.
-Before=systemd-networkd.service
 After=iwd.service
 # Stops NetworkManager and wpa_supplicant if already running
 Conflicts=NetworkManager.service
@@ -22,16 +17,22 @@ After=wpa_supplicant.service
 Type=oneshot
 RemainAfterExit=yes
 Restart=on-failure
-# Probably not needed now
 RestartSec=2sec
 # IWD takes some time to find devices.
 # If naxalnet is run before iwd finds devices,
-# naxalnet cannot start a mesh network.
-# Without the delay, naxalnet could not detect the second
-# device while testing.
+# naxalnet cannot start a mesh network but exits without errors.
 # TODO: Remove this line when naxalnet becomes a daemon.
 ExecStartPre=/usr/bin/sleep 2
 ExecStart=/usr/bin/naxalnet
+# Reload systemd-networkd after naxalnet exits
+ExecStartPost=/usr/bin/systemctl reload-or-restart systemd-networkd.service
+# Delete the interfaces created
+ExecStopPost=/usr/bin/networkctl delete bridge0 bat0
+# Make python flush messages the moment print() is called.
+# Without this env variable, python stores output in a
+# buffer before flushing to stdout. But this is not needed
+# when naxalnet runs as a systemd service.
+Environment=PYTHONUNBUFFERED=1
 
 [Install]
 WantedBy=multi-user.target