app: Remove SKIP_READY option

Current nRF9151DK does not seem to have any problems with HWFC lines
on board controller at boot, so disable the option.

Ready is now always printed.
Updated the Linux script to allow it, but ignore it.

Signed-off-by: Seppo Takalo <seppo.takalo@nordicsemi.no>

Author: SeppoTakalo

app/Kconfig

@@ -24,11 +24,6 @@ config SM_AT_BUF_SIZE
 	help
 	  Size of the buffer for incoming AT commands and modem responses.
 
-config SM_SKIP_READY_MSG
-	bool "Skip ready message"
-	help
-	  Skip sending the ready message when the application is powered on.
-
 #
 # external XTAL for UART
 #

app/overlay-cmux.conf

@@ -5,7 +5,6 @@
 #
 
 CONFIG_SM_CMUX=y
-CONFIG_SM_SKIP_READY_MSG=y
 
 # Zephyr modem subsystem
 CONFIG_MODEM_MODULES=y

app/scripts/sm_start_ppp.sh

@@ -170,7 +170,7 @@ trap cleanup ERR
 stty -F $MODEM $BAUD pass8 raw crtscts clocal
 
 log_dbg "Wait modem to boot"
-if chat -t1 "" "AT" "OK" <$MODEM >$MODEM; then
+if chat -t1 "Ready--" "AT" "OK" <$MODEM >$MODEM; then
 	log_dbg "Modem is in AT mode"
 else
 	log_dbg "Modem not responding, try CMUX Close down..."

app/src/main.c

@@ -286,16 +286,14 @@ static int sm_main(void)
 
 	check_app_fota_status();
 
-	if (!IS_ENABLED(CONFIG_SM_SKIP_READY_MSG)) {
-		if (sm_init_failed) {
-			ret = sm_at_send_str(SM_SYNC_ERR_STR);
-		} else {
-			ret = sm_at_send_str(SM_SYNC_STR);
-		}
+	if (sm_init_failed) {
+		ret = sm_at_send_str(SM_SYNC_ERR_STR);
+	} else {
+		ret = sm_at_send_str(SM_SYNC_STR);
+	}
 
-		if (ret) {
-			return ret;
-		}
+	if (ret) {
+		return ret;
 	}
 
 	/* This is here and not earlier because in case of firmware

app/src/sm_at_host.c

@@ -1109,9 +1109,7 @@ int sm_at_host_power_off(void)
 	const int err = at_host_power_off(false);
 
 	/* Write sync str to buffer so it is sent first when resuming, do not flush. */
-	if (!IS_ENABLED(CONFIG_SM_SKIP_READY_MSG)) {
-		sm_tx_write(SM_SYNC_STR, strlen(SM_SYNC_STR), false, false);
-	}
+	sm_tx_write(SM_SYNC_STR, strlen(SM_SYNC_STR), false, false);
 
 	return err;
 }

doc/migration_notes.rst

@@ -415,3 +415,5 @@ If you need any of those features with this |SM|, please contact customer suppor
     Use the :file:`overlay-ppp.conf` and :file:`overlay-cmux.conf` files instead.
   * The :file:`sm_auto_connect.h` header file.
     Use the ``CONFIG_SM_AUTO_CONNECT*`` Kconfig options to configure automatic network attach.
+  * The ``CONFIG_SM_SKIP_READY_MSG`` Kconfig option.
+    The ``Ready\r\n`` message is always sent when the |SM| application is ready to accept AT commands.