added json support with the network export functionality.

[duysqubix]

To generate a network overview, the XBeeNetwork.export only supports xml.

Simply, I needed json functionality and figured I would contribute to codebase while I am it.

This mimics the exact structure found in the generated XML, but in JSON. They map 1:1 very nicely.

[duysqubix]

Here is an example output from the latest commit:

{
  "xbee_network": {
    "description": "",
    "date": "2021-02-16 14:34:24.729143",
    "map_type": "dynamic",
    "protocol": "3",
    "devices": [
      {
        "addr": "0013A20041BD3346",
        "nwk_address": "FFFE",
        "node_id": " ",
        "role": "Router",
        "hw_version": "23",
        "fw_version": "8075",
        "serial_config": {
          "port": "/dev/ttyUSB0",
          "baud_rate": "9600",
          "data_bits": "8",
          "stop_bits": "1",
          "parity": "0",
          "flow_control": "0"
        },
        "connections": [
          {
            "addr": "0013A20041B625B5",
            "strength": "?",
            "status": "0"
          },
          {
            "addr": "0013A20041BD2A7A",
            "strength": "?",
            "status": "0"
          }
        ]
      },
      {
        "addr": "0013A20041B625B5",
        "nwk_address": "FFFE",
        "node_id": "MYNODE",
        "role": "Router",
        "hw_version": "???",
        "fw_version": "???",
        "connections": [
          {
            "addr": "0013A20041BD3346",
            "strength": "?",
            "status": "0"
          }
        ]
      },
      {
        "addr": "0013A20041BD2A7A",
        "nwk_address": "FFFE",
        "node_id": "SLAVE2",
        "role": "Router",
        "hw_version": "???",
        "fw_version": "???",
        "connections": [
          {
            "addr": "0013A20041BD3346",
            "strength": "?",
            "status": "0"
          }
        ]
      }
    ]
  }
}

XML Equivalent

<network name="%s_network">
	<description />
	<date>2/16/21 2:50:4 PM</date>
	<protocol>3</protocol>
	<map_type>dynamic</map_type>
	<devices>
		<device address="0013A20041BD3346">
			<nwk_address>FFFE</nwk_address>
			<node_id> </node_id>
			<role>Router</role>
			<hw_version>0x23</hw_version>
			<fw_version>8075</fw_version>
			<serial_config>
				<port>/dev/ttyUSB0</port>
				<baud_rate>9600</baud_rate>
				<data_bits>8</data_bits>
				<stop_bits>1</stop_bits>
				<parity>0</parity>
				<flow_control>0</flow_control>
			</serial_config>
			<connections>
				<connection address="0013A20041B625B5">
					<strength>?</strength>
					<status>0</status>
				</connection>
				<connection address="0013A20041BD2A7A">
					<strength>?</strength>
					<status>0</status>
				</connection>
			</connections>
		</device>
		<device address="0013A20041B625B5">
			<nwk_address>FFFE</nwk_address>
			<node_id>MYNODE</node_id>
			<role>Router</role>
			<hw_version />
			<fw_version />
			<connections>
				<connection address="0013A20041BD3346">
					<strength>?</strength>
					<status>0</status>
				</connection>
			</connections>
		</device>
		<device address="0013A20041BD2A7A">
			<nwk_address>FFFE</nwk_address>
			<node_id>SLAVE2</node_id>
			<role>Router</role>
			<hw_version />
			<fw_version />
			<connections>
				<connection address="0013A20041BD3346">
					<strength>?</strength>
					<status>0</status>
				</connection>
			</connections>
		</device>
	</devices>
</network>