Output of --info "Nodes in mesh" to JSON Format

[mverch67]

This is a fix for #416 "Nodes in mesh" is not valid JSON.

The resulting output will look like this:

Nodes in mesh: {"!fa5a06bc": {"num": 4200203964, "user": {"longName": "Meshtastic 06bc", "shortName": "06bc", "macaddr": "f4:12:fa:5a:06:bc", "hwModel": "TLORA_T3_S3"}, "position": {"time": 1680178890}, "lastHeard": 1680178890, "deviceMetrics": {"batteryLevel": 111, "voltage": 4.46, "channelUtilization": 1.78, "airUtilTx": 0.24416666}}, "!55c58b64": {"num": 1439009636, "user": {"longName": "MUGL-8b64", "shortName": "MUGL", "macaddr": "94:b5:55:c5:8b:64", "hwModel": "TBEAM"}, "snr": 6.0, "lastHeard": 1680178620, "deviceMetrics": {"batteryLevel": 88, "voltage": 4.052, "channelUtilization": 3.3933334, "airUtilTx": 0.45066667}}, "!fa5a0688": {"num": 4200203912, "user": {"longName": "NORD-0688", "shortName": "NORD", "macaddr": "f4:12:fa:5a:06:88", "hwModel": "TLORA_T3_S3"}, "snr": 5.5, "lastHeard": 1680178634, "deviceMetrics": {"batteryLevel": 111, "voltage": 4.247, "channelUtilization": 17.903334, "airUtilTx": 2.858639}}, "!fa5a06f8": {"num": 4200204024, "user": {"longName": "Meshtastic 06f8", "shortName": "06f8", "macaddr": "f4:12:fa:5a:06:f8", "hwModel": "TLORA_T3_S3"}, "snr": 5.75, "lastHeard": 1680178675, "deviceMetrics": {"batteryLevel": 111, "voltage": 4.379, "channelUtilization": 11.0, "airUtilTx": 0.4597778}}}

[caveman99]

While the output is valid JSON now, this is a breaking change from previous versions for people that may parse the output of that command manually. Not sure how to proceed with this or if this is even an issue.

[mverch67]

While the output is valid JSON now, this is a breaking change from previous versions for people that may parse the output of that command manually. Not sure how to proceed with this or if this is even an issue.

I see two options:

1- keep it as it is (see output of PR above) and assume that almost nobody did parse the output so far because it was not valid JSON format

2- revert some modifications of the current PR and provide two different versions of info output :-
a) a more human readable output of the nodes (one line per node, each single line in JSON, but not the complete collection of nodes) which does not differ much from previous versions, like this:

Nodes in mesh:
{"num": 4200203964, "user": {"id": "!fa5a06bc", "longName": "Meshtastic 06bc", "shortName": "06bc", "macaddr": "f4:12:fa:5a:06:bc", "hwModel": "TLORA_T3_S3"}, "position": {"time": 1680254909}, "lastHeard": 1680254909, "deviceMetrics": {"batteryLevel": 111, "voltage": 4.333, "channelUtilization": 3.4499998, "airUtilTx": 0.10986111}}
{"num": 1439009636, "user": {"id": "!55c58b64", "longName": "MUGL-8b64", "shortName": "MUGL", "macaddr": "94:b5:55:c5:8b:64", "hwModel": "TBEAM"}, "snr": -14.25, "deviceMetrics": {"batteryLevel": 82, "voltage": 3.998, "channelUtilization": 10.481667, "airUtilTx": 0.8883889}}
{"num": 4200203912, "user": {"id": "!fa5a0688", "longName": "NORD-0688", "shortName": "NORD", "macaddr": "f4:12:fa:5a:06:88", "hwModel": "TLORA_T3_S3"}, "snr": -14.25, "deviceMetrics": {"batteryLevel": 98, "voltage": 4.188, "channelUtilization": 36.946667, "airUtilTx": 2.9026666}}
{"num": 4200204024, "user": {"id": "!fa5a06f8", "longName": "Meshtastic 06f8", "shortName": "06f8", "macaddr": "f4:12:fa:5a:06:f8", "hwModel": "TLORA_T3_S3"}, "snr": 7.25, "lastHeard": 1680254905, "lastReceived": {"from": 4200204024, "to": 4200203964, "id": 1612893115, "rxTime": 1680254905, "rxSnr": 7.25, "hopLimit": 3, "rxRssi": -51, "fromId": "!fa5a06f8", "toId": "!fa5a06bc"}, "hopLimit": 3}

(this is instantly ready for commit on request)

b) optional: an additional machine readable format provided by --json-info (entire info output in valid JSON format)