Differences
This shows you the differences between two versions of the page.
|
iothings:laboratoare:2025:lab12 [2026/01/03 18:45] dan.tudose [Goal] |
iothings:laboratoare:2025:lab12 [2026/01/03 23:05] (current) dan.tudose [Build, flash, test] |
||
|---|---|---|---|
| Line 169: | Line 169: | ||
| * verify ''CONFIG_FS_SHELL'' (and any related symbols) are enabled | * verify ''CONFIG_FS_SHELL'' (and any related symbols) are enabled | ||
| + | <note>Assignment: Add a BME680 logging service with a new "bme_log" shell command, plus a background thread that appends CSV entries with uptime timestamps to a file named bme_log.dat. | ||
| - | ===== 4. Wi‑Fi Webserver + BME680 Sensor Data ===== | + | Usage examples: |
| + | |||
| + | > bme_log start 5 | ||
| + | > bme_log status | ||
| + | > bme_log interval 10 | ||
| + | > bme_log stop | ||
| + | > fs cat /lfs/logs/bme_log.dat | ||
| + | |||
| + | </note> | ||
| + | ===== 4. Wi‑Fi Webserver ===== | ||
| ==== Goal ==== | ==== Goal ==== | ||
| Line 176: | Line 186: | ||
| * connects to Wi‑Fi (WPA2‑PSK) | * connects to Wi‑Fi (WPA2‑PSK) | ||
| * obtains an IPv4 address via DHCP | * obtains an IPv4 address via DHCP | ||
| - | * reads BME680 sensor data periodically | + | * serves a web page to a browser |
| - | * serves the latest sensor values to a browser | + | |
| Line 188: | Line 197: | ||
| ==== Configure the Project ==== | ==== Configure the Project ==== | ||
| - | Create a new folder, e.g. ''sparrow_web_bme'' and unzip the project {{:iothings:laboratoare:2025:sparrow_web_bme.zip|here}}. | + | Create a new folder, e.g. ''sparrow_web'' and unzip the project {{:iothings:laboratoare:2025:sparrow_littlefs_ws.zip|here}}. |
| ==== Build, flash, test ==== | ==== Build, flash, test ==== | ||
| Line 203: | Line 212: | ||
| </code> | </code> | ||
| - | Open serial output and note the printed IP address. | ||
| - | From a machine on the same LAN, open: | ||
| - | * ''http://<device-ip>:<port>/'' | + | The code runs a HTTP static file server backed by LittleFS and auto-started at boot; it serves files from /lfs/www on port 8080 and uses the HTTP server’s static_fs handler. |
| + | |||
| + | In the serial shell, you need to run the following commands: | ||
| + | |||
| + | 1. Connect to WiFi: | ||
| + | <code> | ||
| + | wifi scan | ||
| + | wifi connect -s "SSID" -p "PASS" -k 1 | ||
| + | wifi status | ||
| + | </code> | ||
| + | |||
| + | 2. Check the webserver is up and running and get the board IP address: | ||
| + | <code> | ||
| + | net http | ||
| + | net iface | ||
| + | </code> | ||
| + | |||
| + | 3. Write a simple index.html file into ''/lfs/www'': | ||
| + | <code>fs write /lfs/www/index.html -o 0 3c 68 31 3e 48 69 3c 2f 68 31 3e</code> | ||
| + | |||
| + | 4. Browse: http://[board-ip]:8080/ | ||
| Expected: | Expected: | ||
| - | * browser receives a response containing the latest sensor values | + | * browser receives a response containing "Hi" |
| - | ==== Troubleshooting ==== | + | <note>Assignment: Add a dynamic HTTP endpoint that serves the current contents of bme_log.dat as an HTML page with a 10‑second auto‑refresh. So, if you conect to http://[board-ip]:8080/bme_log it will automatically serve the contents of the log file.</note> |
| - | * No Wi‑Fi logs: | + | |
| - | * raise log level (e.g. default level or module-specific) | + | |
| - | * ensure Wi‑Fi mgmt is enabled | + | |
| - | * No IP address: | + | |
| - | * verify DHCP is enabled | + | |
| - | * ensure DHCP is started after link is up | + | |
| - | * “memory allocation failed” from Wi‑Fi adapter: | + | |
| - | * reduce concurrent HTTP clients | + | |
| - | * reduce buffer sizes (HTTP response buffer) | + | |
| - | * avoid repeated dynamic allocations in the HTTP thread | + | |
| - | * consider increasing heap pool size only if you have flash/RAM headroom | + | |
| - | * Browser connects but gets no response: | + | |
| - | * verify socket calls are using Zephyr’s socket headers | + | |
| - | * verify server binds to INADDR_ANY on the chosen port | + | |
| - | * ensure response includes valid HTTP headers and CRLF | + | |
