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fix(webconfig): rebind port 80 right after a stop #97

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Merged
agessaman merged 1 commit into from
Nov 12, 2026
Merged

fix(webconfig): rebind port 80 right after a stop #97

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2 changes: 2 additions & 0 deletions platformio.ini
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Original file line number Diff line number Diff line change
Expand Up @@ -75,6 +75,8 @@ build_flags = ${arduino_base.build_flags}
-Wl,--wrap=esp_transport_ws_init
; Run dns_gethostbyname on the lwIP thread; see src/helpers/ESP32DnsThreadFix.cpp.
-Wl,--wrap=dns_gethostbyname
; Rebind port 80 during TIME_WAIT; see src/helpers/ESP32TcpBindReuse.cpp.
-Wl,--wrap=tcp_bind
; -D ESP32_CPU_FREQ=80 ; change it to your need
build_src_filter = ${arduino_base.build_src_filter}
+<helpers/esp32/WebConfigServer.cpp> ; empty TU unless WITH_MQTT_BRIDGE
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29 changes: 29 additions & 0 deletions src/helpers/ESP32TcpBindReuse.cpp
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Original file line number Diff line number Diff line change
@@ -0,0 +1,29 @@
// Lets a new port-80 listener bind while an old HTTP connection is still in TIME_WAIT.

#ifdef ESP_PLATFORM

#include <lwip/opt.h>
#include <lwip/ip.h>
#include <lwip/tcp.h>

// Arduino 2.0.17 names the switch SO_REUSE; later cores name it LWIP_SO_REUSE.
#ifndef LWIP_SO_REUSE
#ifdef SO_REUSE
#define LWIP_SO_REUSE SO_REUSE
#else
#define LWIP_SO_REUSE 0
#endif
#endif

extern "C" err_t __real_tcp_bind(struct tcp_pcb* pcb, const ip_addr_t* ipaddr, u16_t port);

extern "C" err_t __wrap_tcp_bind(struct tcp_pcb* pcb, const ip_addr_t* ipaddr, u16_t port) {
#if LWIP_SO_REUSE
if (pcb != NULL && port == 80) {
ip_set_option(pcb, SOF_REUSEADDR);
}
#endif
return __real_tcp_bind(pcb, ipaddr, port);
}

#endif // ESP_PLATFORM
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