1 files changed, 71 insertions, 0 deletions
diff --git a/stacks/tncs/load-serial-env.sh b/stacks/tncs/load-serial-env.sh
new file mode 100755
index 0000000..a7f0e76
--- /dev/null
+++ b/stacks/tncs/load-serial-env.sh
@@ -0,0 +1,71 @@
+# shellcheck shell=bash
+# Load station serial env for TNC boot-wait (tnc2c | pktnc2).
+# Sourced by tnc2c-boot-wait.sh / pktnc2-boot-wait.sh — do not execute directly.
+#
+# Search order (first match wins):
+#   /etc/max25/<id>-serial.env
+#   $MAX25_ROOT/local/<id>-serial.env
+#   $PWD/local/<id>-serial.env          (cwd when start script runs)
+#   <checkout>/local/<id>-serial.env    (walk up from script dir)
+#   $PREFIX/share/max25/stacks/tncs/<id>-serial.env
+
+load_serial_env() {
+  local device_id="${1:?device_id required}"
+  local script_dir="${2:?script_dir required}"
+  local env_name="${device_id}-serial.env"
+  local candidates=()
+  local p dir
+
+  candidates+=("/etc/max25/${env_name}")
+
+  if [[ -n "${MAX25_ROOT:-}" ]]; then
+    candidates+=("${MAX25_ROOT}/local/${env_name}")
+    candidates+=("${MAX25_ROOT}/stacks/tncs/${env_name}")
+  fi
+
+  if [[ -n "${PWD:-}" ]]; then
+    candidates+=("${PWD}/local/${env_name}")
+    candidates+=("${PWD}/stacks/tncs/${env_name}")
+  fi
+
+  dir="${script_dir}"
+  while [[ "${dir}" != "/" ]]; do
+    candidates+=("${dir}/local/${env_name}")
+    candidates+=("${dir}/stacks/tncs/${env_name}")
+    local parent
+    parent="$(dirname "${dir}")"
+    [[ "${parent}" == "${dir}" ]] && break
+    dir="${parent}"
+  done
+
+  candidates+=("${script_dir}/${env_name}")
+
+  local prefix="${script_dir}"
+  for _ in 1 2 3 4; do
+    prefix="$(dirname "${prefix}")"
+    candidates+=("${prefix}/share/max25/stacks/tncs/${env_name}")
+  done
+
+  for p in "${candidates[@]}"; do
+    if [[ -f "${p}" ]]; then
+      # shellcheck source=/dev/null
+      source "${p}"
+      SERIAL_ENV_FILE="${p}"
+      return 0
+    fi
+  done
+  SERIAL_ENV_FILE=""
+  return 1
+}
+
+apply_tnc2c_env() {
+  export TNC_DEV="${TNC2C_DEV:-${TNC_DEV:-/dev/ttyS4}}"
+  export TNC_BAUD="${TNC2C_BAUD:-${TNC_BAUD:-19200}}"
+  export TNC_LINE="${TNC2C_LINE:-${TNC_LINE:-8n1}}"
+}
+
+apply_pktnc2_env() {
+  export TNC_DEV="${PKTNC2_DEV:-${TNC_DEV:-/dev/ttyS5}}"
+  export TNC_BAUD="${PKTNC2_BAUD:-${TNC_BAUD:-9600}}"
+  export TNC_LINE="${PKTNC2_LINE:-${TNC_LINE:-8n1}}"
+}