Facing an issue to send IP to input class which is inside <div> - protractor

Question

I tried these ... none of them worked, any hints pls ...
this.title = 'Diagnostic Tools';
it('should have a title', function() {
browser.driver.get('https://URL');
browser.ignoreSynchronization = true;
browser.driver.findElement(by.id('username')).sendKeys('user');
browser.driver.findElement(by.id('password')).sendKeys('pass123');
browser.driver.findElement(by.name('login')).click();
browser.waitForAngular();
expect(browser.getTitle()).toContain('Diagnostic Tools');
element(by.linkText("TOOLS")).click();
element(by.name('server_ip')).sendKeys('1.1.1.1');
});
});
Tried 3 ways after clicking "TOOLS". Adding sleep btw click & send also didn't help.
element(by.name('server_ip')).sendKeys('1.1.1.1');
element(by.cssContainingText('input[name="server_ip"]')).sendKeys('1.1.1.1');
element(by.css('server_ip')).sendKeys('1.1.1.1');
Input class:
<i><div class="form-group required ng-scope" ng-repeat="(param_key, param_value) in selectedTool.params">
<label class="col-sm-2 control-label ng-binding">IP (s)</label>
<div class="col-sm-4">
<input style="" required="required" pattern="[ ]*((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3})( (25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3})*[ ]*"
class="form-control ng-valid-pattern ng-valid-maxlength ng-dirty ng-valid-parse ng-valid ng-valid-required ng-touched"
name="server_ip" ng-model="toolInput[param_key]" ng-required="true" ng-attr-pattern="{{param_value.pattern}}" ng-attr-type="{{param_value.type}}" ng-attr-min="{{param_value.min}}" ng-attr-max="{{param_value.max}}" ng-attr-maxlength="{{param_value.maxlength}}">
</div>
<div class="col-sm-6">
<span class="help-block ng-binding">Can be multiple space separated ips.</span>
</div>

Answer 1

You need to explicitly wait for the element to be visible prior to sending keys:
var EC = protractor.ExpectedConditions;
var serverIP = element(by.name("server_ip"));
browser.wait(EC.visibilityOf(serverIP), 5000);
serverIP.sendKeys("1.1.1.1");