int8_t CoAP_FindUriQueryVal(CoAP_option_t* pUriOpt, const char* prefixStr, int CmpStrCnt, ...) {
va_list ap; //compare string pointer
int i,j;
char* pStr=NULL;
bool Match=false;
uint8_t* pUriQueryVal;
uint8_t ValLen;
pUriQueryVal = CoAP_GetUriQueryVal(pUriOpt, prefixStr, &ValLen);
if(pUriQueryVal == NULL) return 0;//-1; //prefix not found, no uri-query
va_start (ap, CmpStrCnt); // Initialize the argument list.
for(i=1;i<CmpStrCnt+1;i++) { //loop over all string arguments to compare the found uri query against
pStr = va_arg(ap, char*);
if(coap_strlen(pStr) != ValLen) continue; //already length does not match -> try next given string
Match=true;
for(j=0;j< ValLen; j++) {
if(pStr[j] != pUriQueryVal[j]){
Match=false;
break;
}
}
if(Match==false) continue;
//found argument string matching to uri-query value
va_end (ap);
return i; //return argument number of match
}
va_end (ap);
return 0; //not found
}
static CoAP_HandlerResult_t ICACHE_FLASH_ATTR Res_ReqHandler(CoAP_Message_t* pReq, CoAP_Message_t* pResp) {
if(pReq->Code == REQ_POST) {
CoAP_option_t* pOpt;
bool Found = false;
for(pOpt =pReq->pOptionsList ; pOpt != NULL; pOpt = pOpt->next) {
switch(CoAP_FindUriQueryVal(pOpt,"",3, "on","off", "tgl")) { //no prefix used -> use /led_gpio12?on or /led_gpio12?off
case 0: break; //not found
case 1: led(true); Found=true; break; //found "on"
case 2: led(false); Found=true; break; //found "off"
case 3: led(!LedState); Found=true; break; //found "tgl"
}
if(Found) {
SetLedstatePayload(pReq, pResp);
break;
}
}
if(!Found){
char info[] = {"usage: coap://.../led_gpio12?on (or \"off\", \"tgl\")"};
CoAP_SetPayload(pReq, pResp, info, coap_strlen(info), true);
pResp->Code=RESP_ERROR_BAD_REQUEST_4_00;
}
}else if(pReq->Code == REQ_GET){
SetLedstatePayload(pReq, pResp);
}
return HANDLER_OK;
}
static CoAP_HandlerResult_t ICACHE_FLASH_ATTR NotifyHandler(CoAP_Observer_t* pObserver, CoAP_Message_t* pResp) {
char myString[20];
coap_sprintf(myString,"%d [s]", hal_rtc_1Hz_Cnt());
CoAP_SetPayload(NULL, pResp, myString, coap_strlen(myString), true);
return HANDLER_OK;
}
uint8_t* CoAP_GetUriQueryVal(CoAP_option_t* pUriOpt, const char* prefixStr, uint8_t* pValueLen){
if(pUriOpt == NULL) return NULL;
if(pUriOpt->Number != OPT_NUM_URI_QUERY) return NULL;
if(pUriOpt->Length == 0 || pUriOpt->Length > 255) return NULL;
int prefixLen = coap_strlen(prefixStr);
if(prefixLen >= pUriOpt->Length) return NULL;
int i=0;
for(;i< prefixLen; i++) {
if(pUriOpt->Value[i] != prefixStr[i]) return NULL;
}
//prefix found
if(pValueLen != NULL)
*pValueLen = (pUriOpt->Length) - prefixLen;
return &(pUriOpt->Value[prefixLen]);
}
static void ICACHE_FLASH_ATTR SetLedstatePayload(CoAP_Message_t* pReq, CoAP_Message_t* pResp){
if(LedState) CoAP_SetPayload(pReq, pResp, "Led is on!", coap_strlen("Led is on!"), true);
else CoAP_SetPayload(pReq, pResp, "Led is off!", coap_strlen("Led is off!"), true);
}
