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v6.5.0 (Argon/Boron/B-SoM/B5-SoM/Tracker/Tracker-M/E-SoM-X/M-SoM/P2)

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@avtolstoy avtolstoy released this 17 Jul 17:02
v6.5.0
d16adc1

Device OS 6.5.0 Release is available in the Web IDE, Particle CLI and Workbench for (Argon/Boron/B-SoM/B5-SoM/Tracker/Tracker-M/E-SoM-X/M-SoM/P2).

Released on July 17th, 2026

See documentation about Device OS versions, their current state, upgrades and downgrades here.

6.5.0

FEATURES

  • Multi-byte read()/peek()/write() APIs for hardware UARTs and USB Serial #2935
  • Per-interface cloud keepalive environment variables (PARTICLE_CLOUD_KEEP_ALIVE, PARTICLE_CELLULAR_CLOUD_KEEP_ALIVE, PARTICLE_WIFI_CLOUD_KEEP_ALIVE, PARTICLE_ETHERNET_CLOUD_KEEP_ALIVE) and Particle.getKeepAlive() #2916
  • Power manager PARTICLE_POWER_INPUT_CURRENT and PARTICLE_POWER_CHARGE_CURRENT environment variables #2928 #2929

ENHANCEMENTS

  • Tethering and cellular (PPP) throughput and reliability improvements (adaptive LCP echo, dedicated PPP TX queue) #2932
  • [network] SO_LINGER support for faster TCP pcb/pbuf cleanup #2932
  • [Gen 4] network: improved TCP performance (larger windows/buffers) #2932
  • [M SoM] M635: Enable 2G fallback support #2933

BUGFIXES

  • [Gen 4] Allow USB CDC (Serial) buffers to be resized with acquireSerialBuffer() after first initialization #2932
  • [Gen 4] usart: fix event handling in interrupt mode UARTs causing reads/writes through waitEvent() (e.g. PPP tethering) to only progress on poll timeouts #2932
  • [Gen 4] usart: fix RTS/CTS hardware flow control being silently disabled due to slow clock domain register access #2932
  • [Gen 4] usart: fix FIFO overflow behavior under RTS flow control #2932
  • [Gen 4] usart: fix DMA-mode USART (NCP or Serial2 on P2/Photon2) available()/peek() not accounting for data still residing in the GDMA FIFO e316605
  • [Gen 4] usart: fix received data loss when entering sleep with DMA-mode (Serial2) UART e316605
  • [Gen 4] usart: fix TX buffer handling in interrupt mode e316605
  • [Gen 3] usart: fix interrupt/normal context race condition causing TX transmissions to never start #2932
  • [Gen 3] usart: fix multi-byte peek() not seeing all the data reported by available() e316605
  • [network] tethering: fix TCP MSS clamping in NAT #2932
  • [Gen 4] [Cellular] muxer: prevent USB starvation and busy looping under heavy cellular traffic #2932
  • [network] lwip: fix tcp_pcb double-free in tcp_input_delayed_close() #2932
  • [system] Apply cloud keepalive based on the active network interface when the cloud connection moves between interfaces (ACM) #2916
  • [Gen 4] usb: fix control interface class driver consuming dataIn/dataOut events for unrelated endpoints #2922
  • [Gen 4] usb: distinguish between the host halting reads from USB Serial and a slow host #2932
  • tethering: Fix blocking behavior on writes when tethering over USB #2932
  • [hal] fix os_thread_join() accessing a stale/freed task TCB #2932
  • [hal] fix idle hook priority bump when there are threads pending cleanup, keeping terminated thread resources from being freed #2932
  • [wiring] network: fix null pointer dereference for interfaces without a hardware address #2932
  • [system] Force cloud connection checks on interface state changes only for interfaces that can carry the cloud connection #2932
  • Improve I2C driver reliability: Wire.end() in user application no longer breaks PMIC/FuelGauge access in system power manager #2913
  • Fix race condition on entering POWER_OFF sleep mode with AM18x5 (external RTC) #2927
  • Fix default cloud keepalive values #2926
  • [system] Do not run background network connection test if no networks are ready, avoiding LwIP errors when polling with no connected sockets #2930
  • [Cellular] Workaround for EG916Q returning too large APDU responses #2934

INTERNAL

  • [system] API for scheduling calls in the system thread #2921
  • iperf3 (libiperf) port and tethering throughput HIL test suites (UDP/TCP, bidirectional, USB and Serial1, device-direct cellular paths) #2932 #2920
  • [hal] Coalesce serial stream implementations into a shared one #2932
  • [GCC] Multi-byte serial read/write/peek support and poll()-based serial wait events, fix tinker builds #2935
  • [third_party] lwip: SO_LINGER fixes (abort on close with zero linger timeout, do not abort sockets in LISTEN state), per-pcb RX frame counter for adaptive LCP echo, map ERR_IF to EIO, tcp_pcb double-free fix #2932
  • [third_party] freertos: expose uxTaskGetNumberOfTasksWaitingTermination() #2932
  • [third_party] gsm0710muxer: add GSM0710_COOP_YIELD_MS and GSM0710_MAX_TIMEOUT_ITERATIONS to avoid busy looping and time-share CPU #2932
  • [third_party] coremark: fix builds on the GCC platform #2935
  • [build] [Gen 3] Reclaim >3KB of flash on LTO-enabled platforms with -flto-partition=one #2928
  • [test] Flash a dummy OTA at the start of the test runner suite to reset device service maxSameBinaryAttempts counter, which was blocking OTA updates on repeated test runs #2931
  • [test] Work around spurious USB control transfer stalls (kernel xhci_hcd bug) during pre-sleep mailbox handshake with an explicit mailbox ACK mechanism, propagate mailbox result codes to tests #2923
  • [test] wiring/sleep20: make sure pending reset mailbox messages are received by the test runner before the device goes into sleep #2919
  • [test] wiring/serial_loopback2: always tri-state the loopback buffer in cleanup #2918
  • [test] wiring/serial_loopback/serial_loopback2: parameterize for Serial1/Serial2/Serial3 use, cover multi-byte read/write/peek and available() consistency 538a25c

System Binaries (all devices)

https://github.com/particle-iot/device-os/releases/download/v6.5.0/particle_device-os@6.5.0.zip

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