From 6a3737bac3443f4d62cd2d793cdc4afa7c34bf0f Mon Sep 17 00:00:00 2001 From: "J. Nick Koston" Date: Sun, 11 Jan 2026 17:17:44 -1000 Subject: [PATCH] [improv_serial] Use int8_to_str to avoid heap allocation for RSSI formatting (#13149) --- .../components/improv_serial/improv_serial_component.cpp | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/esphome/components/improv_serial/improv_serial_component.cpp b/esphome/components/improv_serial/improv_serial_component.cpp index 936ff414b1..17d630fe83 100644 --- a/esphome/components/improv_serial/improv_serial_component.cpp +++ b/esphome/components/improv_serial/improv_serial_component.cpp @@ -267,8 +267,10 @@ bool ImprovSerialComponent::parse_improv_payload_(improv::ImprovCommand &command if (std::find(networks.begin(), networks.end(), ssid) != networks.end()) continue; // Send each ssid separately to avoid overflowing the buffer - std::vector data = improv::build_rpc_response( - improv::GET_WIFI_NETWORKS, {ssid, str_sprintf("%d", scan.get_rssi()), YESNO(scan.get_with_auth())}, false); + char rssi_buf[5]; // int8_t: -128 to 127, max 4 chars + null + *int8_to_str(rssi_buf, scan.get_rssi()) = '\0'; + std::vector data = + improv::build_rpc_response(improv::GET_WIFI_NETWORKS, {ssid, rssi_buf, YESNO(scan.get_with_auth())}, false); this->send_response_(data); networks.push_back(ssid); }