Make beacon options configurable on the command line

.github/workflows/build.yaml

@@ -0,0 +1,16 @@
+name: build
+
+on:
+  pull_request:
+  push:
+    branches: [master]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: actions/setup-python@v3
+    - run: |
+        make
+        ./axdigi2018 --help

.github/workflows/pre-commit.yaml

@@ -0,0 +1,14 @@
+name: pre-commit
+
+on:
+  pull_request:
+  push:
+    branches: [master]
+
+jobs:
+  pre-commit:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: actions/setup-python@v3
+    - uses: pre-commit/action@v3.0.0

.gitignore

@@ -0,0 +1,2 @@
+/axdigi2018
+*.o

.pre-commit-config.yaml

@@ -0,0 +1,5 @@
+repos:
+- repo: https://github.com/pre-commit/mirrors-clang-format
+  rev: v17.0.4
+  hooks:
+  - id: clang-format

Makefile

@@ -1,2 +1,15 @@
-all:
-	$(CC) -DDO_NOT_FORWARD_APRS_PACKET -Wall -g -oaxdigi2018 axdigi2018.c hexdump.c
+VERSION = $(shell git rev-parse --short HEAD)
+CFLAGS = -g -Wall
+CPPFLAGS = -DVERSION="\"$(VERSION)\""
+
+SRCS =  \
+	axdigi2018.c
+OBJS = $(SRCS:.c=.o)
+
+all: axdigi2018
+
+axdigi2018: $(OBJS)
+	$(CC) -o $@ $(OBJS)
+
+clean:
+	rm -f axdigi2018 $(OBJS)

README.md

@@ -1,12 +1,31 @@
 # axdigi2018
+
 AX.25 packet radio digipeater for linux
 
-features:
+## Features
+
 - cross port digipeating
 - aprs digipeater interworking
 - periodical beacons
 
-easy install and run:
-* make
-* ./axdigi2018
+## Building
+
+To build `axdigi2018`:
+
+```
+make
+```
+
+To run with default options:
+
+```
+./axdigi2018
+```
+
+## Options
 
+- `--enable-beacon`, `-b` -- enable a periodic beacon every `--beacon-interval` seconds
+- `--beacon-text`, `-t` *text* -- set beacon text
+- `--beacon-dest`, `-d` *callsign* -- set beacon destination
+- `--beacon-interval`, `-i` *seconds* -- set beacon interval (default 300)
+- `--beacon-path`, `-p` *digi1,digi2,...* -- set beacon path