MKR Ethernet Shield booting problem when thernet cable is connected

zeroone · March 2, 2019, 9:52pm

I have an MKR eth shield connected to MKR 1400 GSM using the pins.

I have a problem if there is an ethernet cable connected btw. the eth shield and my DSL router (switch), and I powered the system, the MKR didn't work until I remove the ethernet cable, so it continues work and then reconnect the ethernet cable.

I have tested this problem with another DSL router, and the same I got.

if I have connect the ethernet cable btw. MKR eth shield and my laptop and power the system it works fine.

i'm using an external power supply (5.6 volt and 2 Amp) as follows:

the + from the converter is connected to the vin of the MKR eth shield
the - from the converter is connected to the ground pin of the MKR eth shield.
Any suggestions?

Thank you

zeroone · March 3, 2019, 7:43pm

I did another test by upload a blink example without calling the ethernet shield, but the ethernet shield is connected to the MKR GSM 1400, and I got the same error unless I disconnect the cable then the sketch loaded successfully and then reconnect the cable again.

Juraj · March 3, 2019, 7:48pm

5.6 V is too much for Vin

zeroone · March 3, 2019, 7:54pm

thank you,
I have also tried only 5 volt, and the same result.

Juraj · March 3, 2019, 8:09pm

the GSM module is active? it connects to network after power up?
the Ethernet shield connects on lower layers and it takes power.

zeroone · March 3, 2019, 8:24pm

Juraj:
the GSM module is active? it connects to network after power up?
the Ethernet shield connects on lower layers and it takes power.

No, this is a blink example.
I have tried this test:
I connect a volt meter to the VCC of the MKR eth shield, once I connect the power supply it starts 3.2 volt and immediately dropped to 1.179 and stays at this volt, now once I disconnect the ethernet cable the volt is again 3.2 volt and works fine.

pert · March 4, 2019, 1:49am

I know the GSM module has a very high current draw occasionally. I would not expect this to be an issue for the Blink sketch, but perhaps it still initializes on power on.

There is some information here that might possibly (or perhaps not) be of relevance:

github.com/arduino-libraries/MKRGSM

MKRGSM library not reliable

opened 08:24PM - 20 Nov 18 UTC

alanoatwork

type: imperfection

I've posted this before, but I'll try again. My code is pretty simple. I check f…or SMS messages and then reply back using Hologram's network. I'm using the latest MKRGSM library 1.3.1. I also have a 1400 mAhr lithium battery connected so I'm confident that I don't have a hardware issue related to modem current. Here's my code: ``` #include <MKRGSM.h> const char PINNUMBER[] = " "; const char GPRS_APN[] = "hologram"; const char GPRS_LOGIN[] = " "; const char GPRS_PASSWORD[] = " "; String HOLOGRAM_DEVICE_KEY = "********"; String HOLOGRAM_TOPIC = "_SOCKETAPI_"; GSMClient client; GPRS gprs; GSM gsm(1); // Enable debug GSM_SMS sms; GSMScanner scan; char server[] = "cloudsocket.hologram.io"; int port = 9999; boolean isSMSAvailable = false; char sms_message[145]; void setup() { Serial.begin(115200); //while(!Serial); scan.begin(); connectGSM(); } void connectGSM() { boolean connected = false; while (!connected) { Serial.println("Begin GSM Access"); if ((gsm.begin() == GSM_READY) && (gprs.attachGPRS(GPRS_APN, GPRS_LOGIN, GPRS_PASSWORD) == GPRS_READY)) { connected = true; Serial.println("GSM Access Success"); Serial.println(scan.getCurrentCarrier()); } else { Serial.println("Not connected"); delay(1000); } } } void loop() { if(Serial.available()) { char c = Serial.read(); if(c == 'e') MODEM.debug(); if(c == 'd') MODEM.noDebug(); } // Get any new incoming txt messages int c; if (sms.available()) { int i = 0; while ((c = sms.read()) != -1) { sms_message[i++] = (char)c; } sms_message[i] = '\0'; // Terminate message isSMSAvailable = true; sms.flush(); } if(gsm.isAccessAlive()) { if(gprs.status() != GPRS_READY) { if(gprs.attachGPRS(GPRS_APN, GPRS_LOGIN, GPRS_PASSWORD) == GPRS_READY) Serial.println("GPRS ready!"); else Serial.println("GRPS not ready!"); } } else { Serial.println("Reconnect to GSM..."); connectGSM(); } // Send message back through hologram if(isSMSAvailable) { isSMSAvailable = false; if (client.connect(server, port)) { client.print("{\"k\":\"" + HOLOGRAM_DEVICE_KEY + "\",\"d\":\""); client.print(sms_message); client.println("\",\"t\":\""+HOLOGRAM_TOPIC+"\"}"); client.stop(); } else { MODEM.send("AT+USOER"); } } delay(1000); }` ``` It takes anywhere from a few days to a week or more to exhibit the problem. My logs typically look like this, where the incoming SMS message, "Jdjd", gets received and then repeated back to me via Hologram's network. ``` OK AT+CMGL="REC UNREAD" +CMGL: 19,"REC UNREAD","+19495472010",,"18/11/14,03:53:24+00" Jdjd OK AT+CMGD=19 OK AT+CREG? +CREG: 0,5 OK AT+USOCR=6 +USOCR: 0 OK AT+USOCO=0,"cloudsocket.hologram.io",9999 OK AT+USOWR=0,21,"7B226B223A22433E383375242B57222C2264223A22" +USOWR: 0,21 OK AT+USOWR=0,4,"4A646A64" +USOWR: 0,4 OK AT+USOWR=0,20,"222C2274223A225F534F434B45544150495F227D" +USOWR: 0,20 OK AT+USOWR=0,2,"0D0A" +USOWR: 0,2 OK AT+USOCL=0 OK AT+CMGL="REC UNREAD" OK AT+CREG? +CREG: 0,5` ``` However, after a week or so this happens: ``` `OK AT+CMGL="REC UNREAD" +CMGL: 19,"REC UNREAD","+19495472010",,"18/11/20,19:51:00+00" JDJDJ OK AT+CMGD=19 OK AT+CREG? +CREG: 0,5 OK AT+USOCR=6 +USOCR: 0 OK AT+USOCO=0,"cloudsocket.hologram.io",9999 ERROR +UUSOCL: 0 AT+USOCL=0 ERROR AT+CMGL="REC UNREAD" OK AT+CREG? +CREG: 0,5 OK AT+CMGL="REC UNREAD" OK AT+CREG? +CREG: 0,5 ```` From then on, the library is never able to recover. Any help would be greatly appreciated. The code I submitted is a stripped down version of my application. I've been wanting to release my application using the MKRGSM board but I've been haunted by this issue. I see there's some asynchronous options that aren't well documented and I'm reluctant to use this approach - besides, shouldn't this library be rock solid as documented!

zeroone · March 4, 2019, 6:55am

thank you, I tried another two troubleshooting actions:
1- connect the earth ground from the 220 volt to the box metal rail, and from that I linked another cable to the MKR eth shield "ground", and still no success.
2- at the ethernet cable, I have disconnected not need cables (I keep pins 1,2,3, and 6) in case there is a power passing at the ethernet cable, but also failed.

it is working fine if:
1- power the system using the USB cable even the cable is connected to the same router.
2- if I power the system using 5V to the vin, I have to disconnect the ethernet cable during boot and then reconnect it again.

i'm repeating my last volt meter check:
I connect a volt meter to the VCC of the MKR eth shield, once I connect the power supply it starts 3.2 volt and immediately dropped to 1.179 and stays at this volt, now once I disconnect the ethernet cable the volt is again 3.2 volt and works fine.

anyone has any suggestions or troubleshooting tasks?

zeroone · March 5, 2019, 3:42pm

to share knowledge.

I have contacted Arduino support, and they told me to short between vin & 5v, tested and it worked.
thank you all

pert · March 5, 2019, 9:56pm

Thanks for taking the time to update this thread with the solution you found zeroone! I'm sure anyone else with the same problem will be very grateful.

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MKR Ethernet Shield booting problem when thernet cable is connected

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