modem: modem_cmux: Increase modem cmux buf size

This commit increases the buffer used for commands
in the control channel within an instance of the
modem_cmux module. The buffer was not large enough to
store an MSC command if the optional break signals
where included. This commit fixes the issue and
updates the test suite to use the max size MSC message.

Signed-off-by: Bjarki Arge Andreasen <baa@trackunit.com>

subsys/modem/modem_cmux.c

@@ -23,7 +23,7 @@ LOG_MODULE_REGISTER(modem_cmux, CONFIG_MODEM_MODULES_LOG_LEVEL);
 #define MODEM_CMUX_DATA_FRAME_SIZE_MIN		(MODEM_CMUX_FRAME_SIZE_MAX + \
 						 MODEM_CMUX_DATA_SIZE_MIN)
 
-#define MODEM_CMUX_CMD_DATA_SIZE_MAX		(0x04)
+#define MODEM_CMUX_CMD_DATA_SIZE_MAX		(0x08)
 #define MODEM_CMUX_CMD_FRAME_SIZE_MAX		(MODEM_CMUX_FRAME_SIZE_MAX + \
 						 MODEM_CMUX_CMD_DATA_SIZE_MAX)
 

tests/subsys/modem/modem_cmux/src/main.c

@@ -100,11 +100,11 @@ static uint8_t cmux_frame_dlci2_sabm_cmd[] = {0xF9, 0x0B, 0x3F, 0x01, 0x59, 0xF9
 static uint8_t cmux_frame_dlci2_sabm_ack[] = {0xF9, 0x0B, 0x73, 0x01, 0x92, 0xF9};
 static uint8_t cmux_frame_dlci2_disc_cmd[] = {0xF9, 0x0B, 0x53, 0x01, 0xB8, 0xF9};
 static uint8_t cmux_frame_dlci2_ua_ack[] = {0xF9, 0x0B, 0x73, 0x01, 0x92, 0xF9};
-static uint8_t cmux_frame_control_msc_cmd[] = {0xF9, 0x01, 0xFF, 0x09, 0xE3,
-					       0x05, 0x0B, 0x09, 0x8F, 0xF9};
+static uint8_t cmux_frame_control_msc_cmd[] = {0xF9, 0x01, 0xFF, 0x0B, 0xE3,
+					       0x07, 0x0B, 0x09, 0x01, 0x6C, 0xF9};
 
-static uint8_t cmux_frame_control_msc_ack[] = {0xF9, 0x01, 0xFF, 0x09, 0xE1,
-					       0x05, 0x0B, 0x09, 0x8F, 0xF9};
+static uint8_t cmux_frame_control_msc_ack[] = {0xF9, 0x01, 0xFF, 0x0B, 0xE1,
+					       0x07, 0x0B, 0x09, 0x01, 0x6C, 0xF9};
 
 static uint8_t cmux_frame_control_fcon_cmd[] = {0xF9, 0x01, 0xFF, 0x05, 0xA3, 0x01, 0x86, 0xF9};
 static uint8_t cmux_frame_control_fcon_ack[] = {0xF9, 0x01, 0xFF, 0x05, 0xA1, 0x01, 0x86, 0xF9};