View source for DIY a wifi / network analyzer

== Introduction ==
Use old Debian laptops to analyze wifi behavior. Perhaps use multiple. Make a Grafana or similar interface.

An Ethernet probe also for comparison


Use Grafana, InfluxDB and Telegraf.

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Analyze
* Wi-Fi signal/interference
* the local access point
* LAN switching/routing
* ISP/WAN link
* DNS
* a particular destination/service
* congestion at certain times
* packet loss/jitter rather than simply low bandwidth

Collect 
*Ping latency:	Is connectivity getting slower?
*Packet loss:	Are packets disappearing?
*Jitter:	Is latency unstable?
*DNS response time:	Is DNS contributing to slowness?
*HTTP/HTTPS response time:	Is reaching real services slow?
*Download speed:	Available throughput
*Wi-Fi RSSI:	Signal strength
*Wi-Fi noise/channel:	Possible radio problems
*Wi-Fi bitrate:	Actual negotiated link quality
*Retransmissions:	Wi-Fi/network quality
*Interface traffic:	How heavily the network is being used
*Gateway latency:	Local network vs Internet problem
*WAN latency:	Which link is having trouble
*DHCP/connectivity events:	Intermittent local failures
*Speed test


Record
*SSID
*BSSID
*channel
*RSSI
*noise
*channel width
*MCS/rate
*frequency
*disconnects
*roaming
*packet loss
*latency

The network measurements:
*ping
*fping
*mtr
*iperf3
*DNS queries
*HTTP probes
*speedtest/other speed-test clients

Wi-Fi information
* iw
* iwconfig where applicable
* NetworkManager tools
* nmcli

=== Software ===

# Grafana (dashboard)
# Prometheus of db (influxDB)(time-series store)
## Node Exporter (laptop)
##* CPU, RAM, disk, interface bytes received/sent, interface errors, interface state, system load, uptime, filesystem, etc.
## Blackbox exporter (network measurement)
## optionally Telegraf (general-purpose collection agent).
##* ICMP/ping, HTTP, HTTPS, DNS, TCP, gRPC (192.168.1.1 ← local gateway, ISP gateway ← WAN, 1.1.1.1 ← Internet, 8.8.8.8 ← Internet)
## <code>iw dev wlan0 link</code> provides Wi-Fi-specific information, eg wifi_signal_dbm, wifi_tx_bitrate_mbps, wifi_rx_bitrate_mbps, wifi_frequency, wifi_bssid, wifi_disconnects
## Scheduled (every 30 min?) speedtester

Wireshark/tcpdump

Or use Telegraf:
*HOST
** CPU
** RAM
** disk
** uptime
** interface statistics
*NETWORK
** ping gateway
** ping ISP
** ping Internet
** DNS response time
** HTTP response time
** TCP connection tests
*WIFI
** RSSI
** frequency
** channel
** bitrate
** BSSID
** connection state
*ACTIVE TESTS
** download speed
** upload speed
** latency
**packet loss

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