1.0.6 add a channelURL property

Example usage:
```
meshtastic --setchan tx_power 100 --info
Trigger powerFSM 9
Connected to radio
Setting channel parameter tx_power to 100
Writing modified preferences to device
my_node_num: 2883444536
has_gps: true
num_channels: 13
region: "1.0-US"
hw_model: "tbeam"
firmware_version: "1.0.0"
packet_id_bits: 32
current_packet_id: 816090843
node_num_bits: 32
message_timeout_msec: 300000
min_app_version: 172

preferences {
  position_broadcast_secs: 900
  send_owner_interval: 4
  wait_bluetooth_secs: 120
  screen_on_secs: 300
  phone_timeout_secs: 900
  phone_sds_timeout_sec: 7200
  mesh_sds_timeout_secs: 7200
  sds_secs: 31536000
  ls_secs: 3601
}
channel_settings {
  tx_power: 100
  modem_config: Bw125Cr48Sf4096
  psk: "\324\361\273: )\007Y\360\274\377\253\317Ni\277"
  name: "Default"
}

Channel URL https://www.meshtastic.org/c/#CGQYAyIQ1PG7OiApB1nwvP-rz05pvyoHRGVmYXVsdA==
Nodes in mesh:
{'num': 2883444536, 'user': {'id': '!2462abdddf38', 'longName': 'Bob b', 'shortName': 'Bb', 'macaddr': 'JGKr3d84'}, 'position': {'batteryLevel': 100, 'time': 315969731}}
{'num': 682754228, 'user': {'id': '!246f28b200b4', 'longName': 'Bob b', 'shortName': 'Bb', 'macaddr': 'JG8osgC0'}, 'position': {'batteryLevel': 79, 'time': 316593914}, 'snr': 9.5}
{'num': 2441803616, 'user': {'id': '!5002918af760', 'longName': 'ryan', 'shortName': 'r', 'macaddr': 'UAKRivdg'}, 'position': {'batteryLevel': 61, 'time': 316497304}, 'snr': 10.0}
{'num': 862631397, 'user': {'id': '!c44f336ab5e5', 'longName': 'Unknown b5e5', 'shortName': '?E5', 'macaddr': 'xE8zarXl'}, 'position': {'time': 1597965319}, 'snr': 13.25}
{'num': 2441803548, 'user': {'id': '!5002918af71c', 'longName': 'Unknown f71c', 'shortName': '?1C', 'macaddr': 'UAKRivcc'}, 'position': {'batteryLevel': 47, 'time': 316494981}, 'snr': 9.5}
{'num': 82599254, 'user': {'id': '!fd1004ec5d56', 'longName': 'Unknown 5d56', 'shortName': '?56', 'macaddr': '/RAE7F1W'}, 'position': {}, 'snr': 9.25}
{'num': 2885173400, 'user': {'id': '!2462abf84098', 'longName': 'Unknown 4098', 'shortName': '?98', 'macaddr': 'JGKr+ECY'}, 'position': {'batteryLevel': 4, 'time': 315966200}, 'snr': 10.75}
```

meshtastic/__init__.py

@@ -56,6 +56,7 @@ import time
 import sys
 import traceback
 import time
+import base64
 from . import mesh_pb2
 from . import util
 from pubsub import pub
@@ -190,6 +191,14 @@ class MeshInterface:
         t.set_radio.CopyFrom(self.radioConfig)
         self._sendToRadio(t)
 
+    @property
+    def channelURL(self):
+        """The sharable URL that describes the current channel
+        """
+        bytes = self.radioConfig.channel_settings.SerializeToString()
+        s = base64.urlsafe_b64encode(bytes).decode('ascii')
+        return f"https://www.meshtastic.org/c/#{s}"
+
     def _generatePacketId(self):
         """Get a new unique packet ID"""
         if self.currentPacketId is None:

meshtastic/__main__.py

@@ -127,6 +127,7 @@ def onConnected(interface):
             closeNow = True
             print(interface.myInfo)
             print(interface.radioConfig)
+            print(f"Channel URL {interface.channelURL}")
             print("Nodes in mesh:")
             for n in interface.nodes.values():
                 print(n)