darwin_sdl simulator and networking/MQTT - does it work?

[tardisx]

Hi, I'm hoping to get started developing my application which will use openHASP while I wait for my hardware to be delivered.

After some trial and error, I did manage to get the darwin_sdl simulator running. I can successfully configure static pages via the filesystem.

It's not clear if networking works on the simulator. I have config.json with my MQTT details, and there is sign that it is parsed correctly:

[20:28:07.978][258680/259136  1] CONF: {"mqtt":{"hostname":"simulator_plate","mqtthost":"10.1.15.11","mqttport":1883,"mqttuser":"","mqttpass":"","groupname":"plates"}}

but I never see it connect to MQTT - there is no indication it is doing so in the console output, and no sign of it on my MQTT broker either.

It's unclear if networking is even possible on the simulator - there does not seem to be a lot of documentation on using it.

Can anyone point me in the right direction?

Complete output when running:

[20:28:07.978][258680/259136  1] LVGL: LV_FS_PC ready


        open____ _____ _____ _____
          |  |  |  _  |   __|  _  |
          |     |     |__   |   __|
          |__|__|__|__|_____|__|
        Home Automation Switch Plate
        Open Hardware edition v0.7.0.1


[20:28:07.978][258680/259136  1] DBUG: Configuration directory: /Users/username/Library/Application Support/hasp/hasp
[20:28:07.978][258680/259136  1] DBUG: Environment: darwin_sdl
[20:28:07.978][258680/259136  1] DBUG: Console started
[20:28:07.978][258680/259136  1] MSGR: Starting...
[20:28:07.978][258680/259128  1] LVGL: .//config.json
[20:28:07.978][258680/259136  1] CONF: SPI flash FS mounted
[20:28:07.978][258680/259136  1] CONF: Loading /config.json
[20:28:07.978][258680/259136  1] CONF: {"mqtt":{"hostname":"simulator_plate","mqtthost":"10.1.15.11","mqttport":1883,"mqttuser":"","mqttpass":"","groupname":"plates"}}
[20:28:07.978][258680/259136  1] CONF: Loaded /config.json
[20:28:07.978][258680/259136  1] GPIO: Loading GUI settings
[20:28:07.978][258680/259136  1] GUI : null
[20:28:07.978][258680/259136  1] HASP: Loading HASP settings
[20:28:07.978][258680/259136  1] HASP: null
[20:28:07.978][258680/259136  1] MQTT: Loading MQTT settings
[20:28:07.978][258680/259136  1] CONF: Loading POSIX-specific settings
[20:28:07.978][258680/259136  1] MAIN: null
[20:28:07.978][258680/259136  1] CONF: Settings loaded
[20:28:07.978][258680/259136  1] MSGR: Starting...
[20:28:07.978][258680/259136  1] MSGR: Started
[20:28:07.978][258680/259136  1] TFT : Starting...
[20:28:08.650][258680/259080  1] TFT : Driver     : SDL2
[20:28:08.650][258680/259080  1] TFT : SDL Version: v2.32.10
[20:28:08.650][258680/259080  1] TFT : DMA        : Disabled
[20:28:08.650][258680/259080  1] TFT : Started
[20:28:08.650][258680/259080  1] MAIN: Sysname    : Darwin
[20:28:08.650][258680/259080  1] MAIN: Nodename   : hostname.here
[20:28:08.650][258680/259080  1] MAIN: Release    : 25.3.0
[20:28:08.650][258680/259080  1] MAIN: Version    : Darwin Kernel Version 25.3.0: Wed Jan 28 20:53:31 PST 2026; root:xnu-12377.91.3~2/RELEASE_ARM64_T8103
[20:28:08.650][258680/259080  1] MAIN: Machine    : arm64
[20:28:08.650][258680/259080  1] MAIN: Processor  : arm64
[20:28:08.650][258680/259080  1] MAIN: CPU freq.  : 0 MHz
[20:28:08.650][258680/259080  1] MAIN: OS Version : Darwin 25.3.0
[20:28:08.650][258680/259080  1] LVGL: Starting...
[20:28:08.650][258680/259080  1] LVGL: Version    : 7.11.0
[20:28:08.650][258680/259080  1] LVGL: lv_init: already inited
[20:28:08.650][258680/259080  1] LVGL: MEM size   : 262144
[20:28:08.650][258680/259080  1] LVGL: VFB size   : 131072
[20:28:08.650][258680/258952  1] LVGL: Filesystem : Enabled
[20:28:08.650][258680/258792  1] LVGL: LV_FS_PC ready
[20:28:08.650][258680/258792  1] FONT: FreeType Disabled
[20:28:08.650][257480/257528  1] GUI : Initialize Cursor
[20:28:08.650][256912/256920  1] LVGL: Started
[20:28:08.651][254280/254592  1] HASP: Custom theme loaded
[20:28:08.651][254280/254432  1] HASP: src/hasp/hasp_page.cpp - 165
[20:28:08.651][254280/254432  1] HASP: src/hasp/hasp_page.cpp - 172
[20:28:08.651][254128/254264  1] HASP: src/hasp/hasp_page.cpp - 165
[20:28:08.651][254128/254264  1] HASP: src/hasp/hasp_page.cpp - 172
[20:28:08.651][253976/254104  1] HASP: src/hasp/hasp_page.cpp - 165
[20:28:08.651][253976/254104  1] HASP: src/hasp/hasp_page.cpp - 172
[20:28:08.651][253824/253936  1] HASP: src/hasp/hasp_page.cpp - 165
[20:28:08.651][253824/253936  1] HASP: src/hasp/hasp_page.cpp - 172
[20:28:08.651][253672/253768  1] HASP: src/hasp/hasp_page.cpp - 165
[20:28:08.651][253672/253768  1] HASP: src/hasp/hasp_page.cpp - 172
[20:28:08.651][253520/253600  1] HASP: src/hasp/hasp_page.cpp - 165
[20:28:08.651][253520/253600  1] HASP: src/hasp/hasp_page.cpp - 172
[20:28:08.651][253368/253432  1] HASP: src/hasp/hasp_page.cpp - 165
[20:28:08.651][253368/253432  1] HASP: src/hasp/hasp_page.cpp - 172
[20:28:08.651][253216/253264  1] HASP: src/hasp/hasp_page.cpp - 165
[20:28:08.651][253216/253264  1] HASP: src/hasp/hasp_page.cpp - 172
[20:28:08.651][253064/253096  1] HASP: src/hasp/hasp_page.cpp - 165
[20:28:08.651][253064/253096  1] HASP: src/hasp/hasp_page.cpp - 172
[20:28:08.651][252912/252928  1] HASP: src/hasp/hasp_page.cpp - 165
[20:28:08.651][252912/252928  1] HASP: src/hasp/hasp_page.cpp - 172
[20:28:08.651][252760/252760  0] HASP: src/hasp/hasp_page.cpp - 165
[20:28:08.651][252760/252760  0] HASP: src/hasp/hasp_page.cpp - 172
[20:28:08.651][252592/252592  0] HASP: src/hasp/hasp_page.cpp - 165
[20:28:08.651][252592/252592  0] HASP: src/hasp/hasp_page.cpp - 172
[20:28:08.651][252592/252592  0] HASP: Loading ./pages.jsonl from disk...
[20:28:08.651][252384/252384  0] HASP:     * p1b1 = label
[20:28:08.651][251976/251976  0] HASP:     * p1b2 = btn
[20:28:08.651][251552/251592  1] HASP:     * p1b3 = slider
[20:28:08.651][251240/251272  1] HASP:     * p1b4 = label
[20:28:08.651][251208/251208  0] MSGR: Jsonl fully parsed
[20:28:08.651][251208/251208  0] HASP: Loaded ./pages.jsonl from disk
[20:28:08.651][251208/251208  0] HASP: Changing page to 1
[20:28:08.671][250968/250968  0] HASP: Loading ./boot.cmd from disk...
[20:28:08.672][250968/250968  0] MSGR: Failed to load L:/boot.cmd
[20:28:08.672][250968/250968  0] HASP: Loaded ./boot.cmd from disk
[20:29:22.024][251208/251320  1] HASP: Loading ./idle_short.cmd from disk...
[20:29:22.025][251208/251320  1] MSGR: Failed to load L:/idle_short.cmd
[20:29:22.025][251208/251320  1] HASP: Loaded ./idle_short.cmd from disk
[20:31:47.112][251208/251320  1] HASP: Loading ./idle_long.cmd from disk...
[20:31:47.114][251208/251320  1] MSGR: Failed to load L:/idle_long.cmd
[20:31:47.114][251208/251320  1] HASP: Loaded ./idle_long.cmd from disk