# Problem with MDC API **URL:** \ **Category:** Uncategorized\ **Created:** [February 25, 2021, 6:17am UTC](https://forum.legato.io/t/problem-with-mdc-api/5630 "2021-02-25T06:17:26Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![ClaudioBaldo](https://avatars.discourse-cdn.com/v4/letter/c/b9bd4f/32.png) [@ClaudioBaldo](https://forum.legato.io/u/ClaudioBaldo)\ **Post date:** [February 25, 2021, 6:17am UTC](https://forum.legato.io/t/problem-with-mdc-api/5630/1 "2021-02-25T06:17:26Z")
I am trying to use the MDC API for the FX30S but I am having some troubles and an error which is difficult to troubleshoot. So I have followed these instructions: [https://docs.legato.io/15\_08/c\_mdc.html](https://docs.legato.io/15_08/c_mdc.html) And also these two: > The problem I am having is that this works (at times) and at times doesn`t work. The problem seems to be with the handler which report a wrong status? This is my code static void SetNetworkConfiguration() { char ipAddr[100] = {0}; char gatewayAddr[100] = {0}; char dns1Addr[100] = {0}; char dns2Addr[100] = {0}; char systemCmd[200] = {0}; FILE\* resolvFilePtr; le\_mdc\_ConState\_t state = LE\_MDC\_DISCONNECTED; mode\_t oldMask; ``` // Check the state LE_ASSERT( le_mdc_GetSessionState(modemProfile, &state) == LE_OK ); LE_ASSERT( state == LE_MDC_CONNECTED ); // Get IP, gateway and DNS addresses for IPv4 or IPv6 connectivity if ( le_mdc_IsIPv4(modemProfile) ) { LE_ASSERT(le_mdc_GetIPv4Address(modemProfile, ipAddr, sizeof(ipAddr)) == LE_OK); LE_INFO("%s", ipAddr); LE_ASSERT(le_mdc_GetIPv4GatewayAddress(modemProfile, gatewayAddr, sizeof(gatewayAddr)) == LE_OK); LE_INFO("%s", gatewayAddr); LE_ASSERT(le_mdc_GetIPv4DNSAddresses( modemProfile, dns1Addr, sizeof(dns1Addr), dns2Addr, sizeof(dns2Addr)) == LE_OK ); LE_INFO("%s", dns1Addr); LE_INFO("%s", dns2Addr); snprintf(systemCmd, sizeof(systemCmd), "/sbin/route add default gw %s", gatewayAddr); } else if ( le_mdc_IsIPv6(modemProfile) ) { LE_ASSERT(le_mdc_GetIPv6Address(modemProfile, ipAddr, sizeof(ipAddr)) == LE_OK); LE_INFO("%s", ipAddr); LE_ASSERT(le_mdc_GetIPv6GatewayAddress(modemProfile, gatewayAddr, sizeof(gatewayAddr)) == LE_OK); LE_INFO("%s", gatewayAddr); LE_ASSERT(le_mdc_GetIPv6DNSAddresses( modemProfile, dns1Addr, sizeof(dns1Addr), dns2Addr, sizeof(dns2Addr)) == LE_OK ); LE_INFO("%s", dns1Addr); LE_INFO("%s", dns2Addr); snprintf(systemCmd, sizeof(systemCmd), "/sbin/route -A inet6 add default gw %s", gatewayAddr); } sleep(5); LE_DEBUG("%s", systemCmd); LE_ASSERT( system(systemCmd) == 0 ); // allow fopen to create file with mode=644 oldMask = umask(022); // open the resolver configuration resolvFilePtr = fopen("/etc/resolv.conf", "w+"); if (resolvFilePtr == NULL) { LE_ERROR("Unable to open resolv.conf: %m"); } LE_ASSERT( resolvFilePtr != NULL ); LE_ASSERT( fprintf(resolvFilePtr, "nameserver %s\n", dns1Addr) > 0 ); if (dns2Addr[0] != '\0') { LE_ASSERT( fprintf(resolvFilePtr, "nameserver %s\n", dns2Addr) > 0 ); } LE_ASSERT( fclose(resolvFilePtr) == 0 ); // restore old mask umask(oldMask); ``` } static le\_result\_t ConnectModem(){ //create an handler for Data Connection state char data[200]; char APN[11] = “telstra.wap”; le\_result\_t rs; LE\_FATAL\_IF(modemProfile == NULL, “Profile doesn`t exist"); //set the PDP rs = le_mdc_SetPDP(modemProfile, LE_MDC_PDP_IPV4V6); LE_FATAL_IF(rs != LE_OK, "Couldn`t set PDP.”); //readback the PDP le\_mdc\_Pdp\_t ProfilePDP = le\_mdc\_GetPDP(modemProfile); switch (ProfilePDP) { case LE\_MDC\_PDP\_UNKNOWN: LE\_INFO(“PDP Unknown”); break; case LE\_MDC\_PDP\_IPV4: LE\_INFO(“PDP IPv4”); break; case LE\_MDC\_PDP\_IPV6: LE\_INFO(“IPDP Pv6”); break; case LE\_MDC\_PDP\_IPV4V6: LE\_INFO(“PDP IPv4v6”); break; default: LE\_ERROR(“PDP unsupported %d”, ProfilePDP); break; } //set APN rs = le\_mdc\_SetAPN(modemProfile,&APN[0]); LE\_FATAL\_IF(rs != LE\_OK, “Couldn`t set APN.”); rs = le\_mdc\_GetAPN(modemProfile, &data[0], sizeof(data)); if(LE\_OK == rs) LE\_INFO(“APN: %s, %d”,data, rs); ``` LE_INFO("Try to Start Session."); if (LE_OK == le_mdc_StartSession (modemProfile)) LE_INFO("Modem is connecting."); return LE_OK; ``` } static void DataConnectionStateHandler(le\_mdc\_ProfileRef\_t profileRef, le\_mdc\_ConState\_t ConnectionState, void _contextPtr) { /_ LE\_MDC\_DISCONNECTED Data session is disconnected. LE\_MDC\_AUTHENTICATING Authenticating data session. LE\_MDC\_CONNECTED Data session is connected. LE\_MDC\_SUSPENDING Suspending data session. LE\_MDC\_INCOMING Incoming data session (MT-PDP context request) \*/ le\_mdc\_ConState\_t state = LE\_MDC\_DISCONNECTED; // Check the state LE\_ASSERT( le\_mdc\_GetSessionState(modemProfile, &state) == LE\_OK ); if(ConnectionState != state) LE\_INFO(“State for modem doesn`t match”); ``` switch (ConnectionState) { case LE_MDC_DISCONNECTED: LE_INFO("Modem Disconnected."); LE_INFO("System will try to reconnect"); //ConnectModem(); break; case LE_MDC_AUTHENTICATING: LE_INFO("Modem Authenticating"); break; case LE_MDC_CONNECTED: LE_INFO("Modem Just Connected"); LE_INFO("Go to sleep for a few seconds.."); sleep(3); LE_INFO("Waking up.."); LE_INFO("Setup NETWORK configuration."); SetNetworkConfiguration(modemProfile); break; case LE_MDC_SUSPENDING: LE_INFO("Modem Suspending"); break; case LE_MDC_INCOMING: LE_INFO("Modem Incoming"); break; default: LE_ERROR("Unsupported MDC session state %d", ConnectionState); break; } ``` } COMPONENT\_INIT { LE\_INFO(“Checking modem configuration.”); modemProfile = le\_mdc\_GetProfile(modemProfileIndex); le\_mdc\_ConState\_t modemState = LE\_MDC\_DISCONNECTED; ``` char data[200]; //Check if modem is already connected LE_INFO("Create Handler for Connection State."); le_mdc_SessionStateHandlerRef_t SessionStateHandler = le_mdc_AddSessionStateHandler(modemProfile, DataConnectionStateHandler, NULL); LE_FATAL_IF(SessionStateHandler == NULL, "Session state handler not created!!"); //Connect modem LE_ASSERT( le_mdc_GetSessionState(modemProfile, &modemState) == LE_OK ); if(modemState != LE_MDC_CONNECTED) { LE_INFO("Will start connecting the modem"); rs = ConnectModem(modemProfileIndex); } rs = le_info_GetImei(&data[0], sizeof(data)); LE_INFO("IMEI: %s, %d",data, rs); //now try to connect the router return; ``` } And the program fails at line: LE\_ASSERT( state == LE\_MDC\_CONNECTED ); However, the function only gets called by the handler “DataConnectionStateHandler” once the state of the modem is LE\_MDC\_CONNECTED, so I am a bit confused about why this is happening… Anybody able to help about this problem? ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\ **Post date:** [February 25, 2021, 6:45am UTC](https://forum.legato.io/t/problem-with-mdc-api/5630/2 "2021-02-25T06:45:42Z")
don’t quite understand your problem… do you see problem in CM tool? ---
**Author:** ![ClaudioBaldo](https://avatars.discourse-cdn.com/v4/letter/c/b9bd4f/32.png) [@ClaudioBaldo](https://forum.legato.io/u/ClaudioBaldo)\ **Post date:** [February 25, 2021, 6:56am UTC](https://forum.legato.io/t/problem-with-mdc-api/5630/3 "2021-02-25T06:56:49Z")
I am not talking about the shell commands, trying to configure and start the modem data from a C source file. ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\ **Post date:** [February 25, 2021, 7:07am UTC](https://forum.legato.io/t/problem-with-mdc-api/5630/4 "2021-02-25T07:07:56Z")
if you don’t see problem in shell command, that means there is problem on your C program. Then you can check the source code of CM tool and see what should be port to your application. ---
**Author:** ![ClaudioBaldo](https://avatars.discourse-cdn.com/v4/letter/c/b9bd4f/32.png) [@ClaudioBaldo](https://forum.legato.io/u/ClaudioBaldo)\ **Post date:** [February 25, 2021, 7:17am UTC](https://forum.legato.io/t/problem-with-mdc-api/5630/5 "2021-02-25T07:17:28Z")
where do I find the source for the shell commands? ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\ **Post date:** [February 25, 2021, 7:23am UTC](https://forum.legato.io/t/problem-with-mdc-api/5630/6 "2021-02-25T07:23:35Z")
you can see here: > **[legato-af/apps/tools/cm at master · legatoproject/legato-af](https://github.com/legatoproject/legato-af/tree/master/apps/tools/cm)** > > master/apps/tools/cm ---
**Author:** ![ClaudioBaldo](https://avatars.discourse-cdn.com/v4/letter/c/b9bd4f/32.png) [@ClaudioBaldo](https://forum.legato.io/u/ClaudioBaldo)\ **Post date:** [February 25, 2021, 12:25pm UTC](https://forum.legato.io/t/problem-with-mdc-api/5630/7 "2021-02-25T12:25:05Z")
I have checked the source for the cm data but this is not exactly what I was asking. The code I have used and written above is from the example code of Legato docs, my question is why the handler ConnectionState and the state returned from le\_mdc\_GetSessionState(modemProfile, &state) have different values? This software systematically fails at LE\_ASSERT( state == LE\_MDC\_CONNECTED ) when this function SetNetworkConfiguration is called by the handler only when the state is LE\_MDC\_CONNECTED. The modem will run on bootup but it will not run on any new application download. Is anybody able to provide an answer to this? Thanks 🙂 ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\ **Post date:** [February 25, 2021, 1:22pm UTC](https://forum.legato.io/t/problem-with-mdc-api/5630/8 "2021-02-25T13:22:11Z")
do you mean this line will make the program stopped? LE\_ASSERT( state == LE\_MDC\_CONNECTED ) Also you might need to try the latest test application which is quite different from yours: > ---
**Author:** ![ClaudioBaldo](https://avatars.discourse-cdn.com/v4/letter/c/b9bd4f/32.png) [@ClaudioBaldo](https://forum.legato.io/u/ClaudioBaldo)\ **Post date:** [February 26, 2021, 6:54am UTC](https://forum.legato.io/t/problem-with-mdc-api/5630/9 "2021-02-26T06:54:47Z")
I am testing this software on my target and it happens the same thing: Feb 26 14:48:16 fx30s user.info Legato: INFO | supervisor[1138]/supervisor T=main | app.c app\_Start() 3377 | Starting app ‘mdcTest’ Feb 26 14:48:16 fx30s user.info Legato: INFO | supervisor[1138]/supervisor T=main | app.c CreateFileLink() 1991 | Skipping file link ‘/legato/systems/current/apps/mdcTest/read-only/lib/libComponent\_mdcTestComp.so’ to '/legato/systems/current/appsWriteable/mdcTest/li Feb 26 14:48:16 fx30s user.info Legato: INFO | supervisor[1138]/supervisor T=main | app.c CreateFileLink() 1991 | Skipping file link ‘/legato/systems/current/apps/mdcTest/read-only/bin/mdcTest’ to ‘/legato/systems/current/appsWriteable/mdcTest/bin/mdcTest’: Already Feb 26 14:48:16 fx30s user.info Legato: INFO | supervisor[1138]/supervisor T=main | proc.c proc\_Start() 1389 | Starting process ‘mdcTest’ with pid 3659 Feb 26 14:48:16 fx30s user.info Legato: INFO | supervisor[3659]/supervisor T=main | proc.c proc\_Start() 1354 | Execing ‘mdcTest’ Feb 26 14:48:16 fx30s user.debug Legato: DBUG | _UNKNOWN_[3659]/ T=main | \_componentMain.c \_mdcTestComp\_Init() 29 | Initializing mdcTestComp component library. Feb 26 14:48:16 fx30s user.debug Legato: DBUG | _UNKNOWN_[3659]/framework T=main | le\_mdc\_client.c DoConnectService() 355 | ======= Starting client for ‘mdcTest.mdcTestComp.le\_mdc’ service ======== mdcTest[3659]/framework T=main | LE\_FILENAME InitPool() 303 | Memory pool name ‘framework.msgs-LogControlProtocol’ is truncated to ‘framework.msgs-LogControlProtoc’ mdcTest[3659]/framework T=main | LE\_FILENAME le\_mem\_ForceAlloc() 841 | Memory pool ‘framework.SigMonitor’ overflowed. Expanded to 1 blocks. mdcTest[3659]/framework T=main | LE\_FILENAME le\_mem\_ForceAlloc() 841 | Memory pool ‘framework.SigHandler’ overflowed. Expanded to 1 blocks. mdcTest[3659]/mdcTest\_exe T=main | \_main.c main() 61 | == Starting Event Processing Loop == mdcTest[3659]/mdcTestComp T=main | mdcTest.c \_mdcTestComp\_COMPONENT\_INIT() 612 | ======= MDC TEST STARTED ======= mdcTest[3659]/mdcTestComp T=main | mdcTest.c SetConfiguration() 352 | cid: 1 pdp: 1 apn: auto auth: 1 username: password: mdcTest[3659]/framework T=MDC\_Test | LE\_FILENAME PThreadStartRoutine() 365 | Set nice level to 0. mdcTest[3659]/framework T=MDC\_Test | LE\_FILENAME le\_mem\_ForceAlloc() 841 | Memory pool ‘framework.DestructorObjs’ overflowed. Expanded to 2 blocks. mdcTest[3659]/framework T=MDC\_Test | LE\_FILENAME le\_mem\_ForceAlloc() 841 | Memory pool ‘.le\_mdc\_ClientThreadData’ overflowed. Expanded to 2 blocks. mdcTest[3659]/framework T=MDC\_Test | le\_mdc\_client.c DoConnectService() 355 | ======= Starting client for ‘mdcTest.mdcTestComp.le\_mdc’ service ======== mdcTest[3659]/framework T=MDC\_Test | LE\_FILENAME le\_mem\_ForceAlloc() 841 | Memory pool ‘.le\_mdc\_ClientData’ overflowed. Expanded to 1 blocks. ======= MDC TEST\_SYNC STARTED ======= mdcTest[3659]/mdcTestComp T=MDC\_Test | mdcTest.c StateChangeHandler() 463 | ================================================ mdcTest[3659]/mdcTestComp T=MDC\_Test | mdcTest.c StateChangeHandler() 464 | (int) le\_mdc\_GetProfileIndex(profileRef)=1 mdcTest[3659]/mdcTestComp T=MDC\_Test | mdcTest.c StateChangeHandler() 465 | ConnectionStatus=2 mdcTest[3659]/mdcTestComp T=MDC\_Test | mdcTest.c StateChangeHandler() 486 | ================================================ mdcTest[3659]/mdcTestComp T=main | mdcTest.c SetNetworkConfiguration() 386 | ipAddr=10.250.218.246 mdcTest[3659]/mdcTestComp T=main | mdcTest.c SetNetworkConfiguration() 390 | gatewayAddr=10.250.218.245 mdcTest[3659]/mdcTestComp T=main | mdcTest.c SetNetworkConfiguration() 395 | dns1Addr=10.5.68.232 mdcTest[3659]/mdcTestComp T=main | mdcTest.c SetNetworkConfiguration() 396 | dns2Addr=10.5.209.36 mdcTest[3659]/mdcTestComp T=MDC\_Test | mdcTest.c StateChangeHandler() 463 | ================================================ mdcTest[3659]/mdcTestComp T=MDC\_Test | mdcTest.c StateChangeHandler() 464 | (int) le\_mdc\_GetProfileIndex(profileRef)=1 mdcTest[3659]/mdcTestComp T=MDC\_Test | mdcTest.c StateChangeHandler() 465 | ConnectionStatus=0 mdcTest[3659]/mdcTestComp T=MDC\_Test | mdcTest.c StateChangeHandler() 481 | le\_mdc\_GetDisconnectionReasonExt(profileRef, 0)=45 Feb 26 14:48:16 fx30s user.debug Legato: DBUG | mdcTest[3659]/mdcTestComp T=MDC\_Test | mdcTest.c StateChangeHandler() 482 | le\_mdc\_GetPlatformSpecificDisconnectionCodeExt(profileRef, 0)=1 Feb 26 14:48:16 fx30s user.debug Legato: DBUG | mdcTest[3659]/mdcTestComp T=MDC\_Test | mdcTest.c StateChangeHandler() 486 | ================================================ mdcTest[3659]/mdcTestComp T=main | mdcTest.c SetNetworkConfiguration() 421 | /sbin/route add default gw 10.250.218.245 mdcTest[3659] | route: SIOCADDRT: Network is unreachable mdcTest[3659]/mdcTestComp T=main | Assert Failed: ‘system(systemCmd) == 0’ supervisor[1138]/supervisor T=main | proc.c Process ‘mdcTest’ (PID: 3659) has exited with exit code 1. ---
**Author:** ![ClaudioBaldo](https://avatars.discourse-cdn.com/v4/letter/c/b9bd4f/32.png) [@ClaudioBaldo](https://forum.legato.io/u/ClaudioBaldo)\ **Post date:** [February 26, 2021, 6:58am UTC](https://forum.legato.io/t/problem-with-mdc-api/5630/10 "2021-02-26T06:58:11Z")
Where it will initially connect, than the handler will return the DISCONNECT for unknown reason? I am using this device with a telstra sim card in australia. The only thing I did add to this code is a fixed APN name for the network: const char \* APN = “telstra.wap”; LE\_ASSERT(LE\_OK == le\_mdc\_SetAPN(\*profileRefPtr, APN)); And also removed the le\_thread\_Sleep for which I can`t find the include file in the legato workspace. The APN I am certain it works correctly, as if I run the command from shell cm data connect It will connect properly. Not sure if replacing the le\_thread\_Sleep with sleep is causing the issue, as I see documentation says this could cause bugs, but don`t think this is the problem. The modem is disconnecting straight after connecting for no reason (as far as it looks). ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\ **Post date:** [February 26, 2021, 8:57am UTC](https://forum.legato.io/t/problem-with-mdc-api/5630/12 "2021-02-26T08:57:24Z")
I have problem in starting the data connection, do you know why? [logread.txt](https://forum.legato.io/uploads/short-url/26oa6mBQCU7QWf0tJRZwiUSDEmy.txt) (12.8 KB) ---
**Author:** ![ClaudioBaldo](https://avatars.discourse-cdn.com/v4/letter/c/b9bd4f/32.png) [@ClaudioBaldo](https://forum.legato.io/u/ClaudioBaldo)\ **Post date:** [February 27, 2021, 4:55am UTC](https://forum.legato.io/t/problem-with-mdc-api/5630/13 "2021-02-27T04:55:47Z")
Is there anybody able to help on clarifying how this mdc API should work? As I said, on bootup the modem will start, but if I try to run the app when the device is already up and running, then it will not work with the message I have reported above. ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\ **Post date:** [February 27, 2021, 5:08am UTC](https://forum.legato.io/t/problem-with-mdc-api/5630/14 "2021-02-27T05:08:36Z")
can you check in your code if le\_mdc\_StopSession() is called? ---
**Author:** ![ClaudioBaldo](https://avatars.discourse-cdn.com/v4/letter/c/b9bd4f/32.png) [@ClaudioBaldo](https://forum.legato.io/u/ClaudioBaldo)\ **Post date:** [February 27, 2021, 6:06am UTC](https://forum.legato.io/t/problem-with-mdc-api/5630/15 "2021-02-27T06:06:07Z")
I am not running my code but a copy an paste of the link you have sent, all beside the change I have indicated above, reaplcing le\_thread\_sleep with sleep and hardcoding the APN to the APN I am using. ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\ **Post date:** [March 1, 2021, 7:03am UTC](https://forum.legato.io/t/problem-with-mdc-api/5630/16 "2021-03-01T07:03:49Z")
I tried on another WP76, I don’t see any problem on running the application, you can see my logread. [logread\_mdeTest.txt](https://forum.legato.io/uploads/short-url/xO2lu5iubgMwRHxpvhSUg1pL5RV.txt) (22.8 KB) root@swi-mdm9x28-wp:~# cm info Device: WP7609 IMEI: 359782080100373 IMEISV: 6 FSN: WA803370311610 Firmware Version: SWI9X07Y\_02.28[529.721111] i2c-msm-v2 78b8000.i2c: NACK: slave not responding, ensure its powered: msgs(n:1 cur:0 tx) bc(rx:0 tx:2) mode:FIFO slv\_addr:0x3a MSTR\_STS:0x001363c8 OPER:0x00000090 .03.05 000000 jenkins 2019/07/08 11:04:16 Bootloader Version: [529.740566] i2c-msm-v2 78b8000.i2c: NACK: slave not responding, ensure its powered: msgs(n:1 cur:0 tx) bc(rx:0 tx:2) mode:FIFO slv\_addr:0x3a MSTR\_STS:0x001363c8 OPER:0x00000090 SWI9X07Y\_02.28.03.05 000000 jenkins 2019/07/08 11:04:16 MCU Version: 002.011 PRI Part Number (PN): 9908102 PRI Revision: 001.000 Carrier PRI Name: GENERIC Carrier PRI Revision: 002.073\_000 SKU: 1103843 Last Reset Cause: Power Down Resets Count: Expected: 10226 Unexpected: 0 ---
**Author:** ![ClaudioBaldo](https://avatars.discourse-cdn.com/v4/letter/c/b9bd4f/32.png) [@ClaudioBaldo](https://forum.legato.io/u/ClaudioBaldo)\ **Post date:** [March 4, 2021, 12:39pm UTC](https://forum.legato.io/t/problem-with-mdc-api/5630/17 "2021-03-04T12:39:32Z")
I can`t get it to work, the only thing I can think of is another app using the same interface and so conditioning the handler in my app. When I have built my system, how can I am my own firmware release so to eliminate apps which I don`t need? i.e. the AirVantage is installed and if I remove it will come back after a reboot… ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\ **Post date:** [March 4, 2021, 12:51pm UTC](https://forum.legato.io/t/problem-with-mdc-api/5630/18 "2021-03-04T12:51:19Z")
you might try to “app stop” the unwanted application. Also you might try with default WP76 FW R13, I don’t see problem with it. ---
**Author:** ![ClaudioBaldo](https://avatars.discourse-cdn.com/v4/letter/c/b9bd4f/32.png) [@ClaudioBaldo](https://forum.legato.io/u/ClaudioBaldo)\ **Post date:** [March 4, 2021, 12:54pm UTC](https://forum.legato.io/t/problem-with-mdc-api/5630/19 "2021-03-04T12:54:58Z")
Tried with the app stop already, also tried with the app remove. Will give it a go with the different firmware to see how it goes. ---
**Author:** ![ClaudioBaldo](https://avatars.discourse-cdn.com/v4/letter/c/b9bd4f/32.png) [@ClaudioBaldo](https://forum.legato.io/u/ClaudioBaldo)\ **Post date:** [March 5, 2021, 2:07am UTC](https://forum.legato.io/t/problem-with-mdc-api/5630/20 "2021-03-05T02:07:55Z")
mmmhh, I have updated the firmware on the target using the WP77xx\_Release13\_GENERIC\_GCF.exe and that seems to have broken the target. No apps installed and I can`t flash back the .cwe file from shell as the fwupdate app is not running anymore. I can`t download my system either as I get: sh: /legato/systems/current/bin/update: not found cat: write error: Broken pipe update failed ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\ **Post date:** [March 5, 2021, 2:39am UTC](https://forum.legato.io/t/problem-with-mdc-api/5630/21 "2021-03-05T02:39:27Z")
i tried on mangoh red +WP77 on FW R13 before, no problem is found. [Next page](https://forum.legato.io/t/problem-with-mdc-api/5630.md?page=2)