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after cold reboot , we can't see any error message most of time, sometimes we can see the messages as below

"\r\nR"
] "DY\r\n"
] "\r\nR"
] "DY\r\n"
] "\r\nR"
] "DY\r\n"
] "\r\nR"
] "DY\r\n"
] "\r\nR"
] "DY\r\n"

if we do "Load" this time , then everything worked fine.

there is no any error when doing "Load",

load();
=undefined
Loading 11308 bytes from flash...
Running onInit()...
onInit...
Start Testing...
Connecting Cellular Modem ...
Cellular Modem connected.
BME280 wiring set up.
["AT&F0\r\n"
] "AT&F0\r\r\nOK\r\n"
["ATE0\r\n"
] "ATE0\r\r"
] "\nOK\r\n"
.......

it can be restarted by P21RESET to GND.

after re-flashing your latest 'cutting edge' build( 8/4/2019), it seems be improved, but still not reliable. sometime it hanged, sometime the codes lost . the board can't be restarted by shorting TILT_DOUT to 3.3v , also it can't be restarted by shorting P21RESET to 3.3v or GND.

it worked when we used the really simple code, when we tested by using https://github.com/wklenk/rak8212-esprui­no-nb-iot/blob/master/upload-ssl-certs-t­o-bg96.js.

it can work after modifying a little for Singapore Cat-M1. even worked fine after doing "save", but it hanged when we restarted the board by turning off and turn on power

not hanging when doing " save", it's hanging when new restarting.

anyone can help ?

Hi Gordon, can you please tell us how to solve it?

I also met the same problem by using the latest espruino_2v01_RAK8212.hex (3 April,2019), could you please share with me how to solve it?

There have errors:

ncaught Error: Cannot read property 'startsWith' of undefined
at line 1 col 5
if(a.startsWith("AT+"))return e;if(a.startsWith("+CME ERROR:...

when calling gps.get(function(data) and GPRS On.

there is no such error if using GPS only.

My SIM card is CAT-M1

My SIM Card is CAT-M1, I can use it to send out /receive SMS on the Hand-phone

not, it only can run /but get error messages. The old board got a lot of exceptions since the SIM card contact point not good

there is one error message "ERROR { "code": -15,
"message": "no response"
}
after we changed the code as below

function connectionReady() {
    
   console.log("connectionReady.");
    
  var http = require("http");
  http.get("http://www.pur3.co.uk/hello.tx­t", function(res) {
    res.on('data', function(data) {
      console.log(data);
    });
  })
  .on('error', function(err) {
      console.log('ERROR', err);
   });
}

AT+QCSQ
+QCSQ: "CAT-M1",-67,-93,130,-9
connectionReady

below are some AT command responses .

+CEREG: 2,1,"2EB","B2A3106",8
AT+QNWINFO
+QNWINFO: "CAT-M1","52501","LTE BAND 3",1300
AT+QSPN
+QSPN: "Singtel","Singtel","Singtel",0,"52501"
AT+QCSQ
+QCSQ: "CAT-M1",-125,0,8,0

do you have whole one program( include AT ,HTTP , SMS ) for testing? we can't get any http data by executing your examples, there is no any error message .

we bought new RAK8212 board, now still can not send out /receive SMS . there have error " CMGL ERROR Test mmmm ", sometimes there is no any error but also can not send out /receive SMS .

we confirmed we can use the same SIM card to send /receive SMS on hand-phone

we used the same codes as above, finally we found the error also was caused by sim card socket ,there is no any error if we push SIM card. but we still can not send out SMS or received SMS . can you confirm BG96 can work in Singapore?

does it support update firmware by serial port ( RX:29, TX:28) ? can it flash arduino sketch by by serial port ( RX:29, TX:28) ?

I am using Battery 18650, 3.7V 3600maAH , so it's not power problem.

we finally found this is because of SIM card contact point not good. every time we need to push SIM card to make it working

there is one error "Uncaught ATE0 ERROR undefined " when we tested SMS funtion, anybody can help?

when to use bootloader  for RAM8212?what is that for?  without it ,  ESPruino  can run on RAK8212.