Error while calling RCSwitch::switchOn

[DeveloperTK]

Hi, I am currently writing a program, where an RCSwitch can be controlled by HTTP Requests. I wrote some code in order to parse the GET Argument:

String header; // HTTP-Header

char ht[header.length()];
header.toCharArray(ht, header.length());
char* firstLine = strtok(ht, "\n");
char* line2 = firstLine + 4;
char* query = strtok(line2, " ");
char* params = strtok(query, "/");
String par2 = String(strtok(params, "?"));

// par2 looks something like like this: 11111000101

String house = par2.substring(0, 5); // in this case: 11111
String device = par2.substring(5, 10); // in this case: 00010
String state = par2.substring(10); // in this case 1

Then I convert the strings to char* and try to call the RCSwitch::switchOn function:

char* house2;
char* device2;
char* state2;

house.toCharArray(house2, 5);
device.toCharArray(device2, 5);
state.toCharArray(state2, 5);

if(state == "1") {
  trans.switchOn(house2, device2);
} else {
  trans.switchOff(house2, device2);
}

Then somehow, it spits out this:

Guru Meditation Error: Core  1 panic'ed (LoadProhibited). Exception was unhandled.
Core 1 register dump:
PC      : 0x400d2bf2  PS      : 0x00060430  A0      : 0x800d2d6d  A1      : 0x3ffb1cd0  
A2      : 0x00000000  A3      : 0x00000000  A4      : 0x00000000  A5      : 0x00000001  
A6      : 0x3ffb1f68  A7      : 0xff000000  A8      : 0x00000000  A9      : 0x00000005  
A10     : 0x3ffc11b8  A11     : 0x3f401663  A12     : 0x00000030  A13     : 0x00000046  
A14     : 0x00ff0000  A15     : 0xff000000  SAR     : 0x00000010  EXCCAUSE: 0x0000001c  
EXCVADDR: 0x00000000  LBEG    : 0x400d2bf0  LEND    : 0x400d2c06  LCOUNT  : 0x00000004  

Backtrace: 0x400d2bf2:0x3ffb1cd0 0x400d2d6a:0x3ffb1cf0 0x400d1406:0x3ffb1d10 0x400d46e5:0x3ffb1fb0 0x40089499:0x3ffb1fd0

which translates to this:

PC: 0x400d2bf2: RCSwitch::getCodeWordA(char const*, char const*, bool) at /Users/.../Documents/Arduino/libraries/rc-switch-2.6.3/RCSwitch.cpp line 300
EXCVADDR: 0x00000000

Decoding stack results
0x400d2bf2: RCSwitch::getCodeWordA(char const*, char const*, bool) at /Users/.../Documents/Arduino/libraries/rc-switch-2.6.3/RCSwitch.cpp line 300
0x400d2d6a: RCSwitch::switchOn(char const*, char const*) at /Users/.../Documents/Arduino/libraries/rc-switch-2.6.3/RCSwitch.cpp line 277
0x400d1406: loop() at /Users/.../Documents/Arduino/espRFWebControl/espRFWebControl.ino line 141
0x400d46e5: app_main() at /Users/.../Library/Arduino15/packages/esp32/hardware/esp32/1.0.4/cores/esp32/main.cpp line 26
0x40089499: vPortTaskWrapper at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/freertos/port.c line 143

(espRFWebControl.ino line 141 is trans.switchOn(house2, device2);)

[1technophile]

Hi,

Did you tried to serial print the result of:

house.toCharArray(house2, 5);
device.toCharArray(device2, 5);
state.toCharArray(state2, 5);

before injecting it into RCSwitch commands?

[DeveloperTK]

yes that gave me

11111
00010
1

as expected

[1technophile]

Declare only the char array size that you need:

char* house2;
char* device2;
char* state2;

And be careful about null terminator

[1technophile]

manually executing the command turns the switch on/off.

Could you elaborate on what do you mean by manually, please?

Could you post the whole code also?

[DeveloperTK]

And be careful about null terminator

Thank you that resolved the problem. I ended up doing this:

char house2[6];
char device2[6];
char state2[2];

house.toCharArray(house2, 6);
device.toCharArray(device2, 6);
state.toCharArray(state2, 2);