How to make a button that send msg once on click and sends msg repeated at set interval on button hold?

I assume you mean is it possible to speed up the messages the longer the button is held?
Yes, of course, anything is possible.

chrome_gjQ37wuTZi

You can tweak the template to your liking. The part of the code that is controlling repeat in this update is this...

        var repeatButtons = $(BUTTON_CLASS + "[data-buttontype='repeater']") 
        repeatButtons.on('mousedown',function(e) {
            var btn = $(this);
            if(this.running) return; //already in operation
            var topic = btn.data("topic");//get the topic from attribute data-topic="xxxxx"
            var payload = btn.data("payload");//get the payload from attribute data-payload="xxxxx"
            var interval = btn.data("interval");//get the desired repeat duration
            if(isNumeric(interval) == false || interval < 1) interval = 300;//prevent zero & non numeric timeout value
            const queueSend = (msg, delay, iteration) => {
                if(!this.running) { return }
                $scope.send(msg)
                if(iteration == 5) { delay = delay/2 }//half the delay (speed up after 5 pulses)
                setTimeout(() => {
                    msg.iteration = iteration;
                    if(this.running) {
                        queueSend(msg, delay, iteration+1)
                    }
                },delay) 
            }
            this.running = true;
            queueSend({"topic":topic,"payload":payload},interval,1 )
        }).on('mouseup blur focusout',function(e) {
            this.running = false;
        });

If you want it to go faster after 10 messages, then you could change this

    if(iteration == 5) { delay = delay/2 }//half the delay (speed up after 5 pulses)

to this...

    if(iteration == 5) { delay = delay/2 }//half the delay (speed up after 5 pulses)
    else if(iteration == 10) { delay = delay/2 }//half it again after 10 pulses! 

Demo flow...

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       />\n    </md-button>\n</div>\n","storeOutMessages":true,"fwdInMessages":true,"templateScope":"local","x":682,"y":428,"wires":[[]]},{"id":"57de4e.f4cfb1b4","type":"ui_template","z":"a7b009fd18302719","group":"a381801e.309e1","name":"Home","order":21,"width":"1","height":"1","format":"<div>\n   <md-button class=\"md-button remote-button\" \n        data-topic=\"home\"\n        data-payload=\"home\" \n        aria-label=\"home\"\n    >\n    <i class=\"fa fa-home remote-icon\"> </i>\n   </md-button>\n</div>\n","storeOutMessages":true,"fwdInMessages":true,"templateScope":"local","x":802,"y":428,"wires":[[]]},{"id":"a6df6e36.1d16b","type":"ui_template","z":"a7b009fd18302719","group":"a381801e.309e1","name":"Vid","order":22,"width":"1","height":"1","format":"<div>\n   <md-button class=\"md-button remote-button small\" \n        data-topic=\"video\"\n        data-payload=\"video\" \n    >Video\n   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data-icon1=\"volume_mute\"\n              aria-label=\"volume mute\"\n              >\n      <i class=\"material-icons md-48\">volume_mute</i>\n   </md-button>\n</div>\n","storeOutMessages":true,"fwdInMessages":true,"templateScope":"local","x":802,"y":348,"wires":[[]],"info":"  class=\"material-icons\"> volume_off"},{"id":"6eeb00d0.da35b","type":"ui_template","z":"a7b009fd18302719","group":"a381801e.309e1","name":"vol +  *","order":14,"width":1,"height":1,"format":"<div>\n   <md-button class=\"md-button remote-button\" \n        data-buttontype=\"repeater\"\n        data-interval=\"200\"\n        data-topic=\"volume/plus\"\n        data-payload=\"volume/plus\"\n        aria-label=\"volume plus\"\n    >\n    <span class=\"fa fa-plus remote-icon\"> </span>\n   </md-button>\n</div>\n\n\n","storeOutMessages":true,"fwdInMessages":false,"templateScope":"local","x":682,"y":348,"wires":[[]],"info":"<div id=\"regular_plus\">\n   <md-button class=\"md-button remote-button\">\n      <i class=\"fa 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document loaded\n    //(may not be necessary!)\n    setTimeout(function() {\n        //debugger\n        $scope.init();\n    },100);\n    \n    var BUTTON_CLASS = \".remote-button\";\n\n    /** \n     * Initialise all buttons with class BUTTON_CLASS\n    */\n    $scope.init = function () {\n        //debugger\n        console.log(\"$scope.init called. Adding event handlers to all buttons with class '\" + BUTTON_CLASS + \"'.\");\n        var clickButtons = $(BUTTON_CLASS + \":not([data-buttontype='repeater'])\") \n        clickButtons.click(function(e){\n            //debugger\n            var btn = $(this)\n            var type = btn.data(\"buttontype\");//get the button type from attribute data-buttontype=\"xxxxx\"\n            var topic = btn.data(\"topic\");//get the topic from attribute data-topic=\"xxxxx\"\n            var payload = btn.data(\"payload\");//get the payload from attribute data-payload=\"xxxxx\"\n            \n            if(type == \"toggle\"){\n                var newPayload = payload == 1 ? 0 : 1;\n                setButtonState(btn,newPayload)\n                $scope.send({\"topic\":topic,\"payload\":newPayload})\n            } else {\n                $scope.send({\"topic\":topic,\"payload\":payload})\n            }\n        }); \n\n        var repeatButtons = $(BUTTON_CLASS + \"[data-buttontype='repeater']\") \n        repeatButtons.on('mousedown',function(e) {\n            var btn = $(this);\n            if(this.running) return; //already in operation\n            var topic = btn.data(\"topic\");//get the topic from attribute data-topic=\"xxxxx\"\n            var payload = btn.data(\"payload\");//get the payload from attribute data-payload=\"xxxxx\"\n            var interval = btn.data(\"interval\");//get the desired repeat duration\n            if(isNumeric(interval) == false || interval < 1) interval = 300;//prevent zero & non numeric timeout value\n            const queueSend = (msg, delay, iteration) => {\n                if(!this.running) { return }\n                $scope.send(msg)\n                if(iteration == 5) { delay = delay/2 }//half the delay (speed up after 5 pulses)\n                setTimeout(() => {\n                    msg.iteration = iteration;\n                    if(this.running) {\n                        queueSend(msg, delay, iteration+1)\n                    }\n                },delay) \n            }\n            this.running = true;\n            queueSend({\"topic\":topic,\"payload\":payload},interval,1 )\n        }).on('mouseup blur focusout',function(e) {\n            this.running = false;\n        });\n           \n    };\n    \n    //watch for node-red msgs\n    $scope.$watch('msg', function(msg) {\n        //debugger\n        if(!msg){ //if no msg \n            console.log(\"$scope.$watch('msg', ...) - msg is empty\");\n            return;\n        }\n        if(!msg.topic){ //if no topic set found\n            console.log(\"msg.topic is empty - cannot match this to any button\")\n            return; //stop processing!\n        }\n        var buttonSelector = \".remote-button[data-topic='\" + msg.topic + \"']\" \n        var $btn = $(buttonSelector);//get the button\n        \n        if(!$btn.length){ //if no button found\n            console.log(buttonSelector + \" not found - cannot set state\")\n            return; //stop processing!\n        }\n        \n        if($btn.length > 1){ //if MORE than one button found\n            console.log(buttonSelector + \" found more than 1 button - is this intended? Do you have the same data-topic set on multiple buttons?\")\n        }\n        \n        if($btn.data(\"buttontype\") === \"toggle\"){\n            if(msg.payload == \"1\"){\n                setButtonState($btn, 1);\n            } else if(msg.payload == \"0\"){\n                setButtonState($btn, 0);\n            } else {\n               console.log(\"Invalid toggle value in msg.payload, cannot set \" + buttonSelector + \". Ensure msg.payload is either 0 or 1\") \n            }\n        }\n\n    }); \n    \n    /** \n    * helper function to set the correct icon & update the \"data-payload\" memory \n    */\n    function setButtonState($btn, state){\n        \n        $btn.data(\"payload\", state);//set data-payload to new state value (used as a memory)\n        \n        //determine the opposite state\n        var oppositeState;\n        if(state == \"1\" || state === 1){\n            state = 1; //normalise to a number\n            oppositeState = 0;\n        } else {\n            state = 0; //normalise to a number\n            oppositeState = 1;\n        }\n        \n        var $icon = $btn.find(\"i\"); //get the <i> element\n        if(!$icon.length){\n            $icon = $btn.find(\"span\"); //get the <span> element instead!\n        }\n        if(!$icon.length){\n            console.log(\"<i> or <span> not found inside button - cant toggle the icon!\")\n            return;//exit this function - nothing to toggle!\n        }\n        \n        //get the old icon and new icon names\n        var oldIcon = $btn.data(\"icon\" + oppositeState); //get icon1 or icon2 depending on oppositeState\n        var newIcon = $btn.data(\"icon\" + state); //get icon1 or icon2 depending on newPayload\n       \n        //if we have newIcon and an actual DOM element ($icon) - update it...\n        if(newIcon && $icon.length){\n            if(newIcon.includes(\"fa-\")){ \n                $icon.removeClass(oldIcon).addClass(newIcon);  // fontawesome\n            } else { \n                $icon.text(newIcon); // MDI\n            }\n        }\n    }\n        \n    /** \n    * helper function to determine a value is REALLY a number \n    */\n    function isNumeric(n){\n        if(n === \"\") return false;\n        if(n === true || n === false) return false;\n        return !isNaN(parseFloat(n)) && isFinite(n);\n    }\n   \n\n})(scope);\n</script>","storeOutMessages":true,"fwdInMessages":true,"resendOnRefresh":false,"templateScope":"local","className":"","x":802,"y":588,"wires":[["a90df8f.7eac108"]]},{"id":"a90df8f.7eac108","type":"debug","z":"a7b009fd18302719","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":882,"y":528,"wires":[]},{"id":"b5beb822.d8e4d8","type":"ui_template","z":"a7b009fd18302719","group":"a381801e.309e1","name":"lock","order":23,"width":"1","height":"1","format":"<div>\n   <md-button class=\"md-button remote-button bigger\" \n              data-payload=\"0\" \n              data-buttontype=\"toggle\"\n              data-topic=\"lock\"\n              data-icon0=\"fa-unlock\"\n              data-icon1=\"fa-lock\"\n              aria-label=\"lock\"\n              >\n      <span class=\"fa fa-unlock\" aria-hidden=\"true\"> </span>\n   </md-button>\n</div>","storeOutMessages":true,"fwdInMessages":true,"templateScope":"local","x":802,"y":468,"wires":[[]]},{"id":"be17d3d4.a92a6","type":"ui_group","name":"HOME","tab":"6af80cca.442cb4","order":1,"disp":true,"width":3,"collapse":false},{"id":"a381801e.309e1","type":"ui_group","name":"Full_Remote2","tab":"9e72c753.ebf048","order":3,"disp":false,"width":"3","collapse":false},{"id":"6af80cca.442cb4","type":"ui_tab","name":"TEST","icon":"dashboard","order":3,"disabled":false,"hidden":false},{"id":"9e72c753.ebf048","type":"ui_tab","name":"HDMI_TV_control","icon":"dashboard","order":7,"disabled":false,"hidden":false}]