Simple tool for sending RFCOMM commands

One might use it as follows:
$ printf "+VGS=15"             |bluealsa-rfcomm 01:23:45:67:89:AB
$ printf "RING\nSLEEP 3\nRING" |bluealsa-rfcomm 01:23:45:67:89:AB

.travis.yml

@@ -14,6 +14,7 @@ addons:
       - libfdk-aac-dev
       - libglib2.0-dev
       - libncurses5-dev
+      - libreadline-dev
       - libsbc-dev
 
 before_script:

LICENSE.txt

@@ -1,6 +1,7 @@
 The MIT License
 
-Copyright (c) 2016-2017 Arkadiusz Bokowy <[email protected]>
+Copyright (c) 2016-2018 Arkadiusz Bokowy <[email protected]>
+              2018 Wade Berrier
               2017 Guillaume Zin
               2017 Juha Kuikka
 

configure.ac

@@ -75,6 +75,10 @@ AC_ARG_ENABLE([aplay],
 	[AS_HELP_STRING([--disable-aplay], [disable building of bluealsa-aplay tool])])
 AM_CONDITIONAL([ENABLE_APLAY], [test "x$enable_aplay" != "xno"])
 
+AC_ARG_ENABLE([rfcomm],
+	[AS_HELP_STRING([--disable-rfcomm], [disable building of bluealsa-rfcomm tool])])
+AM_CONDITIONAL([ENABLE_RFCOMM], [test "x$enable_rfcomm" != "xno"])
+
 AC_ARG_ENABLE([hcitop],
 	[AS_HELP_STRING([--enable-hcitop], [enable building of hcitop tool])])
 AM_CONDITIONAL([ENABLE_HCITOP], [test "x$enable_hcitop" = "xyes"])

utils/Makefile.am

@@ -1,5 +1,5 @@
 # BlueALSA - Makefile.am
-# Copyright (c) 2016-2017 Arkadiusz Bokowy
+# Copyright (c) 2016-2018 Arkadiusz Bokowy
 
 bin_PROGRAMS =
 
@@ -20,6 +20,20 @@ bluealsa_aplay_LDADD = \
 	@GIO2_LIBS@
 endif
 
+if ENABLE_RFCOMM
+bin_PROGRAMS += bluealsa-rfcomm
+bluealsa_rfcomm_SOURCES = \
+	../src/shared/ctl-client.c \
+	../src/shared/log.c \
+	rfcomm.c
+bluealsa_rfcomm_CFLAGS = \
+	-I$(top_srcdir)/src \
+	@BLUEZ_CFLAGS@
+bluealsa_rfcomm_LDADD = \
+	@BLUEZ_LIBS@ \
+	-lreadline
+endif
+
 if ENABLE_HCITOP
 bin_PROGRAMS += hcitop
 hcitop_CFLAGS = \

utils/rfcomm.c

@@ -0,0 +1,165 @@
+/*
+ * BlueALSA - rfcomm.c
+ * Copyright (c) 2016-2018 Arkadiusz Bokowy
+ *
+ * This file is a part of bluez-alsa.
+ *
+ * This project is licensed under the terms of the MIT license.
+ *
+ */
+
+#if HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <ctype.h>
+#include <errno.h>
+#include <getopt.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <readline/readline.h>
+#include <readline/history.h>
+
+#include "shared/ctl-client.h"
+#include "shared/log.h"
+
+static char *strtrim(char *str) {
+  while (isspace(*str))
+		str++;
+  if (*str == '\0')
+    return str;
+  char *end = &str[strlen(str) - 1];
+  while (end > str && isspace(*end))
+		end--;
+  end[1] = '\0';
+  return str;
+}
+
+static char *build_rfcomm_command(const char *cmd) {
+
+	static char command[512];
+	bool at;
+
+	command[0] = '\0';
+	if (!(at = strncmp(cmd, "AT", 2) == 0))
+		strcpy(command, "\r\n");
+
+	strcat(command, cmd);
+	strcat(command, "\r");
+	if (!at)
+		strcat(command, "\n");
+
+	return command;
+}
+
+int main(int argc, char *argv[]) {
+
+	int opt;
+	const char *opts = "hVi:";
+	const struct option longopts[] = {
+		{ "help", no_argument, NULL, 'h' },
+		{ "version", no_argument, NULL, 'V' },
+		{ "hci", required_argument, NULL, 'i' },
+		{ 0, 0, 0, 0 },
+	};
+
+	const char *ba_interface = "hci0";
+	int status = EXIT_SUCCESS;
+	int ba_fd = -1;
+	bdaddr_t ba_addr;
+
+	log_open(argv[0], false, false);
+
+	while ((opt = getopt_long(argc, argv, opts, longopts, NULL)) != -1)
+		switch (opt) {
+		case 'h' /* --help */ :
+usage:
+			printf("Usage:\n"
+					"  %s [OPTION]... <BT-ADDR>\n"
+					"\nOptions:\n"
+					"  -h, --help\t\tprint this help and exit\n"
+					"  -V, --version\t\tprint version and exit\n"
+					"  -i, --hci=hciX\tHCI device to use\n",
+					argv[0]);
+			return EXIT_SUCCESS;
+
+		case 'V' /* --version */ :
+			printf("%s\n", PACKAGE_VERSION);
+			return EXIT_SUCCESS;
+
+		case 'i' /* --hci */ :
+			ba_interface = optarg;
+			break;
+
+		default:
+			fprintf(stderr, "Try '%s --help' for more information.\n", argv[0]);
+			return EXIT_FAILURE;
+		}
+
+	if (optind + 1 != argc)
+		goto usage;
+
+	if (str2ba(argv[optind], &ba_addr) != 0) {
+		error("Invalid BT device address: %s", argv[optind]);
+		goto fail;
+	}
+
+	if ((ba_fd = bluealsa_open(ba_interface)) == -1) {
+		error("BlueALSA connection failed: %s", strerror(errno));
+		goto fail;
+	}
+
+	if (isatty(fileno(stdin))) {
+
+		char prompt[17 + 3];
+		char *line;
+
+		rl_bind_key('\t', rl_insert);
+
+		sprintf(prompt, "%s> ", argv[optind]);
+		while ((line = readline(prompt)) != NULL) {
+			char *tmp = strtrim(line);
+			if (strlen(tmp) > 0) {
+				if (bluealsa_send_rfcomm_command(ba_fd, ba_addr, build_rfcomm_command(tmp)) == -1)
+					warn("Couldn't send RFCOMM command: %s", strerror(errno));
+				add_history(tmp);
+			}
+			free(line);
+		}
+
+		fprintf(stdout, "\n");
+
+	}
+	else {
+
+		char line[256];
+		int duration;
+
+		while (fgets(line, sizeof(line), stdin) != NULL) {
+			char *tmp = strtrim(line);
+			if (strlen(tmp) > 0) {
+				if (sscanf(tmp, "%*[Ss]%*[Ll]%*2[Ee]%*[Pp] %d", &duration) == 1) {
+					sleep(duration);
+					continue;
+				}
+				if (bluealsa_send_rfcomm_command(ba_fd, ba_addr, build_rfcomm_command(tmp)) == -1)
+					warn("Couldn't send RFCOMM command: %s", strerror(errno));
+			}
+		}
+
+	}
+
+	goto success;
+
+fail:
+	status = EXIT_FAILURE;
+
+success:
+	if (ba_fd != -1)
+		close(ba_fd);
+	return status;
+}