toJson method
Implementation
Map<String, dynamic> toJson() => {
'id': nodeId,
'r': role,
if (groupId != null) 'g': groupId,
'ts': lastSeen,
'h': hopCount,
if (displayName != null) 'n': displayName,
if (batteryLevel != null) 'bl': batteryLevel,
if (hasInternetAccess) 'net': hasInternetAccess,
};